Macroglossia
/ˌmækroʊˈɡlɒsiə/
Abnormal enlargement of the tongue.
Macrophthalmia
/ˌmækrɒfˈθælmiə/
Abnormal enlargement of the eyeball.
Macroscopic
/ˌmækroʊˈskɒpɪk/
Visible to the naked eye; not microscopic.
Macular edema
/ˈmækjʊlər ɪˈdiːmə/
Fluid buildup and swelling in the macula of the eye.
Malignant hypertension
/məˈlɪɡnənt ˌhaɪpərˈtɛnʃən/
Extremely high blood pressure that develops rapidly and causes organ damage.
Malignant melanoma
/məˈlɪɡnənt ˌmɛləˈnoʊmə/
A dangerous form of skin cancer that begins in melanocytes.
Malleable
/ˈmæliəbəl/
Capable of being shaped or bent; often used to describe certain surgical instruments.
Malunion
/mælˈjuːnjən/
Healing of a fractured bone in a poor position.
Mandible
/ˈmændɪbəl/
The lower jawbone; the largest and strongest bone of the face.
Mandibular
/mænˈdɪbjʊlər/
Pertaining to the mandible or lower jaw.
Manganese
/ˈmæŋɡəniːz/
A trace mineral essential for bone formation and metabolic functions.
Mania
/ˈmeɪniə/
A mental state characterized by very high energy, excitement, and racing thoughts.
Mantle
/ˈmæntəl/
The cerebral cortex; the outer layer of gray matter in the brain.
Manubriosternal
/məˌnuːbrioʊˈstɜːrnəl/
Relating to the joint between the manubrium and the body of the sternum.
Manubrium
/məˈnuːbriəm/
The broad upper part of the sternum (breastbone).
Mapping
/ˈmæpɪŋ/
The localization of specific areas, such as brain mapping or genetic mapping.
Marasmus
/məˈræzməs/
Severe undernourishment causing an infant's or child's weight to be significantly low for their age.
Marrow
/ˈmæroʊ/
The soft fatty substance in the cavities of bones, in which blood cells are produced.
Mask of pregnancy
/mæsk əv ˈprɛɡnənsi/
Melasma; dark patches on the face that occur during pregnancy.
Masseter
/mæˈsiːtər/
A powerful muscle that facilitates chewing, located in the cheek.
Mastectomy
/mæˈstɛktəmi/
Surgical removal of one or both breasts, partially or completely.
Mastication
/ˌmæstɪˈkeɪʃən/
The medical term for chewing.
Mastitis
/mæˈstaɪtɪs/
Inflammation of the breast tissue, often involving an infection.
Mastoid process
/ˈmæstɔɪd ˈprɒsɛs/
A conical prominence of the temporal bone behind the ear.
Mastopexy
/ˈmæstəˌpɛksi/
A surgical procedure to raise and firm the breasts by removing excess skin and tightening the surrounding tissue; a breast lift.
Maturation
/ˌmætʃʊˈreɪʃən/
The process of reaching full development or ripening, whether of a cell, a tissue, or an individual.
Maxilla
/mækˈsɪlə/
The bone that forms the upper jaw and part of the nose and eye sockets.
McBurney's point
/məkˈbɜːrniz pɔɪnt/
A point on the abdominal wall that corresponds to the location of the appendix; tenderness here is a classic sign of appendicitis.
Mean arterial pressure
/miːn ɑːrˈtɪəriəl ˈprɛʃər/
MAP; the average arterial pressure during a single cardiac cycle, considered a better indicator of perfusion to vital organs.
Measles
/ˈmiːzəlz/
A highly contagious viral disease marked by fever and a characteristic red rash, preventable by the MMR vaccine.
Meatotomy
/ˌmiːəˈtɒtəmi/
A surgical procedure to enlarge the meatus (opening) of the urethra.
Meatus
/miˈeɪtəs/
A natural body opening or canal (e.g., the external auditory meatus).
Meconium
/mɪˈkoʊniəm/
The dark green substance forming the first feces of a newborn infant.
Medial
/ˈmiːdiəl/
Anatomical term meaning toward the middle or midline of the body.
Median nerve
/ˈmiːdiən nɜːrv/
A major nerve of the upper limb; compression of this nerve at the wrist causes Carpal Tunnel Syndrome.
Mediastinum
/ˌmiːdiəˈstaɪnəm/
The central compartment of the chest cavity between the lungs, containing the heart.
Medulla
/mɪˈdʌlə/
The innermost part of an organ or structure, such as the renal medulla (kidney) or adrenal medulla.
Medulla oblongata
/mɪˈdʌlə ˌɒblɒŋˈɡætə/
The lowest part of the brainstem, controlling autonomic functions like breathing and heart rate.
Megacolon
/ˌmɛɡəˈkoʊlən/
Abnormal dilation of the colon, often accompanied by paralysis of the bowel movements.
Megakaryocyte
/ˌmɛɡəˈkærioʊsaɪt/
A large bone marrow cell responsible for the production of blood platelets.
Megaloblast
/ˈmɛɡələblæst/
A large, abnormally developed red blood cell precursor.
Meiosis
/maɪˈoʊsɪs/
A type of cell division that results in four daughter cells each with half the number of chromosomes of the parent cell.
Meissner's corpuscles
/ˈmaɪsnərz ˈkɔːrpʌsəlz/
Sensory nerve endings in the skin that are sensitive to light touch.
Melancholia
/ˌmɛlənˈkoʊliə/
A severe form of depression characterized by deep sadness and lack of interest in everything.
Melanin
/ˈmɛlənɪn/
A dark brown to black pigment occurring in the hair, skin, and iris of the eye.
Melanocyte
/mɪˈlænəˌsaɪt/
A cell in the skin and eyes that produces the pigment melanin.
Melanoma
/ˌmɛləˈnoʊmə/
A serious type of skin cancer that develops from the pigment-producing cells.
Melanotic
/ˌmɛləˈnɒtɪk/
Pertaining to the presence of melanin; often used to describe dark-colored stools (melena).
Melasma
/mɪˈlæzmə/
A condition in which brown patches appear on the face, often triggered by hormonal changes or sun exposure.
Melatonin
/ˌmɛləˈtoʊnɪn/
A hormone primarily released by the pineal gland that regulates the sleep-wake cycle.
Melena
/məˈliːnə/
Dark sticky feces containing partly digested blood, typically following internal bleeding.
Membrane
/ˈmɛmbreɪn/
A thin pliable layer of tissue covering surfaces or separating regions in an organism.
Menarche
/mɛˈnɑːrki/
The first occurrence of menstruation.
Meninges
/mɪˈnɪndʒiːz/
The three membranes (dura mater, arachnoid mater, and pia mater) that line the skull and vertebral canal.
Meningitis
/ˌmɛnɪnˈdʒaɪtɪs/
Inflammation of the meninges caused by viral or bacterial infection.
Meniscus
/mɪˈnɪskəs/
A C-shaped piece of tough, rubbery cartilage that acts as a shock absorber between the shinbone and the thighbone.
Menometrorrhagia
/ˌmɛnoʊˌmɛtrəˈreɪdʒə/
A condition characterized by excessive uterine bleeding at both the usual time of menstruation and at irregular intervals.
Menopause
/ˈmɛnəˌpɔːz/
The ceasing of menstruation, typically occurring between 45 and 50 years of age.
Menorrhagia
/ˌmɛnəˈreɪdʒə/
Abnormally heavy bleeding at menstruation.
Menstruation
/ˌmɛnstruˈeɪʃən/
The process in a woman of discharging blood and other materials from the lining of the uterus at intervals of about one lunar month.
Mesencephalon
/ˌmɛzɛnˈsɛfəlɒn/
The technical name for the midbrain.
Mesentery
/ˈmɛzənˌtɛri/
A fold of the peritoneum that attaches the stomach, small intestine, and other organs to the posterior wall of the abdomen.
Mesothelioma
/ˌmɛzoʊˌθiːliˈoʊmə/
A malignant tumor that is caused by inhaled asbestos fibers and forms in the lining of the lungs, abdomen, or heart.
Metabolism
/məˈtæbəˌlɪzəm/
The chemical processes that occur within a living organism in order to maintain life.
Metabolism
/məˈtæbəˌlɪzəm/
The sum of all chemical reactions in the body, divided into anabolism (building) and catabolism (breaking down).
Metacarpal
/ˌmɛtəˈkɑːrpəl/
Any of the five bones of the hand between the wrist (carpus) and the fingers (phalanges).
Metacarpophalangeal
/ˌmɛtəkɑːrpoʊfəˈlændʒiəl/
MCP; the large joints at the base of the fingers, often called knuckles.
Metamorphopsia
/ˌmɛtəmɔːrˈfɒpsiə/
A type of distorted vision in which straight lines appear wavy or bent, often a sign of retinal problems.
Metaphysis
/mɪˈtæfɪsɪs/
The narrow portion of a long bone between the epiphysis and the diaphysis.
Metaphysis
/mɪˈtæfɪsɪs/
The growing part of a long bone between the diaphysis (shaft) and the epiphysis (end).
Metaplasia
/ˌmɛtəˈpleɪʒə/
The transformation of one type of mature tissue into another, often as a response to chronic irritation.
Metastasis
/məˈtæstəsɪs/
The development of secondary malignant growths at a distance from a primary site of cancer.
Metatarsal
/ˌmɛtəˈtɑːrsəl/
Any of the bones of the foot between the ankle (tarsus) and the toes (phalanges).
Metatarsalgia
/ˌmɛtətɑːrˈsældʒə/
A condition marked by pain and inflammation in the ball of the foot.
Metformin
/mɛtˈfɔːrmɪn/
A first-line medication used to treat type 2 diabetes by lowering glucose production in the liver.
Microangiopathy
/ˌmaɪkroʊˌændʒiˈɒpəθi/
A disease of the very small blood vessels (capillaries), frequently a complication of diabetes.
Microbe
/ˈmaɪkroʊb/
A microorganism, especially a bacterium causing disease or fermentation.
Microcephaly
/ˌmaɪkroʊˈsɛfəli/
Abnormal smallness of the head, a congenital condition associated with incomplete brain development.
Microembolism
/ˌmaɪkroʊˈɛmbəˌlɪzəm/
A small embolus (blood clot or air bubble) that obstructs a small blood vessel.
Microglia
/maɪˈkrɒɡliə/
Small glial cells that serve as the primary immune defense in the central nervous system.
Micturition
/ˌmɪktjʊˈrɪʃən/
The medical term for urination.
Micturition reflex
/ˌmɪktjʊˈrɪʃən ˈriːflɛks/
The nervous system reflex that triggers the urge to urinate and coordinates the emptying of the bladder.
Mid-axillary line
/mɪd ækˈsɪlɛri laɪn/
A vertical landmark line starting at the center of the armpit and extending down the side of the chest.
Midbrain
/ˈmɪdbreɪn/
A small central part of the brainstem, developing from the middle of the primitive or embryonic brain.
Migraine
/ˈmaɪɡreɪn/
A recurrent throbbing headache that typically affects one side of the head and is often accompanied by nausea and disturbed vision.
Milliequivalent
/ˌmɪliɪˈkwɪvələnt/
mEq; a unit of measurement used for electrolytes like sodium and potassium in the blood.
Mineralocorticoid
/ˌmɪnərəloʊˈkɔːrtɪkɔɪd/
A class of steroid hormones (like aldosterone) that regulate salt and water balance.
Miosis
/maɪˈoʊsɪs/
Excessive constriction of the pupil of the eye.
Miscarriage
/ˈmɪsˌkærɪdʒ/
The spontaneous loss of a woman's pregnancy before the 20th week.
Mistletoe sign
/ˈmɪsəltoʊ saɪn/
A radiographic appearance where lung shadows resemble mistletoe, sometimes seen in sarcoidosis.
Mitochondria
/ˌmaɪtəˈkɒndriə/
Organelles in the cell often called the 'powerhouse,' responsible for creating ATP (energy).
Mitosis
/maɪˈtoʊsɪs/
A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus.
Mitral valve
/ˈmaɪtrəl vælv/
The valve between the left atrium and the left ventricle of the heart, consisting of two tapered cusps.
Mitral valve prolapse
/ˈmaɪtrəl vælv ˈproʊlæps/
MVP; a condition where the heart's mitral valve flaps don't close smoothly, sometimes causing blood to leak backward.
Mobilization
/ˌmoʊbɪlɪˈzeɪʃən/
The act of making a part of the body movable; in physical therapy, it refers to moving a joint or limb.
Modified radical mastectomy
/ˈmɒdɪfaɪd ˈrædɪkəl mæˈstɛktəmi/
A surgery for breast cancer that removes the entire breast and axillary lymph nodes, but leaves the chest muscles.
Mohs surgery
/moʊz ˈsɜːrdʒəri/
A precise surgical technique used to treat skin cancer by removing thin layers of skin and examining them under a microscope until only cancer-free tissue remains.
Molar
/ˈmoʊlər/
A grinding tooth at the back of a mammal's mouth.
Molding
/ˈmoʊldɪŋ/
The natural process by which a baby's head changes shape to fit through the birth canal during delivery.
Mole
/moʊl/
A common skin growth (nevus) made of pigment-forming cells; also a unit of chemical measurement.
Molluscum contagiosum
/məˈlʌskəm kənˌteɪdʒiˈoʊsəm/
A viral skin infection that causes small, painless, pearly bumps.
Monckeberg's arteriosclerosis
/ˈmɒŋkəbɜːrɡz ɑːrˌtɪərioʊsklɪˈroʊsɪs/
Calcium deposits in the muscular layer of medium-sized arteries, usually not blocking blood flow.
Mongolian spot
/mɒŋˈɡoʊliən spɒt/
A flat, bluish-gray birthmark, common in infants of color, usually found on the lower back or buttocks.
Monoclonal antibody
/ˌmɒnəˈkloʊnəl ˈæntɪˌbɒdi/
Laboratory-made proteins that mimic the immune system's ability to fight off harmful pathogens or cancer cells.
Monocyte
/ˈmɒnəˌsaɪt/
A type of white blood cell that eventually leaves the blood to become a macrophage in the tissues.
Mononucleosis
/ˌmɒnoʊˌnuːkliˈoʊsɪs/
Often called 'mono', it is an infectious disease usually caused by the Epstein-Barr virus.
Monoplegia
/ˌmɒnəˈpliːdʒə/
Paralysis affecting only one limb.
Monosaccharide
/ˌmɒnəˈsækəˌraɪd/
The simplest form of sugar, such as glucose or fructose, that cannot be broken down further into simpler sugars.
Mons pubis
/mɒnz ˈpjuːbɪs/
The rounded mass of fatty tissue lying over the joint of the pubic bones.
Mood stabilizer
/muːd ˈsteɪbɪˌlaɪzər/
A psychiatric medication used to treat mood disorders characterized by intense shifts, such as bipolar disorder.
Moon face
/muːn feɪs/
A medical sign where the face becomes round and full, typically due to long-term steroid use or Cushing's syndrome.
Morbidity
/mɔːrˈbɪdəti/
The condition of being diseased; the rate of disease in a population.
Moro reflex
/ˈmɔːroʊ ˈriːflɛks/
The 'startle reflex' in infants, where they throw back their head and extend their arms in response to a loud noise or sudden movement.
Morphine
/ˈmɔːrfiːn/
A potent opioid analgesic used to treat severe pain, derived from the opium poppy.
Morphology
/mɔːrˈfɒlədʒi/
The study of the size, shape, and structure of cells or organisms.
Mortality
/mɔːrˈtæləti/
The state of being subject to death; the death rate in a population.
Mortician
/mɔːrˈtɪʃən/
A person whose job is to prepare dead bodies for burial or cremation.
Morula
/ˈmɒrjʊlə/
A solid ball of cells resulting from division of a fertilized ovum, and from which a blastula is formed.
Motility
/moʊˈtɪləti/
The ability of an organism or fluid to move spontaneously and actively (e.g., sperm motility).
Motor neuron
/ˈmoʊtər ˈnjʊərɒn/
A nerve cell forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland.
MRI
/ˌɛm ɑːr ˈaɪ/
Abbreviation for Magnetic Resonance Imaging.
Mucolytic
/ˌmjuːkəˈlɪtɪk/
A medication capable of dissolving or breaking down mucus.
Mucopurulent
/ˌmjuːkoʊˈpjʊərʊlənt/
Containing both mucus and pus.
Mucosa
/mjuːˈkoʊsə/
A mucous membrane; the moist, inner lining of some organs and body cavities.
Mucous membrane
/ˈmjuːkəs ˈmɛmbreɪn/
The moist, protective lining of body cavities that open to the outside.
Mucus
/ˈmjuːkəs/
A slippery secretion produced by, and covering, mucous membranes.
Multifactorial
/ˌmʌltifækˈtɔːriəl/
Involving or dependent on a number of factors, especially genetic and environmental.
Multigravida
/ˌmʌltiˈɡrævɪdə/
A woman who is or has been pregnant for at least the second time.
Multilocular
/ˌmʌltiˈlɒkjʊlər/
Divided into many small cavities or compartments.
Multiorgan failure
/ˈmʌltiˌɔːrɡən ˈfeɪljər/
The clinical dysfunction of two or more organ systems in an acutely ill patient.
Multipara
/mʌlˈtɪpərə/
A woman who has had more than one pregnancy resulting in viable offspring.
Multiple myeloma
/ˈmʌltɪpəl ˌmaɪəˈloʊmə/
A cancer that forms in a type of white blood cell called a plasma cell.
Multiple sclerosis
/ˈmʌltɪpəl sklɪˈroʊsɪs/
A chronic disease involving damage to the sheaths of nerve cells in the brain and spinal cord.
Mumps
/mʌmps/
A viral infection that primarily affects the parotid glands near the ears.
Mural thrombus
/ˈmjʊərəl ˈθrɒmbəs/
A blood clot that forms on the wall of a large blood vessel or heart chamber.
Murine
/ˈmjʊəraɪn/
Relating to mice or rats.
Murmur
/ˈmɜːrmər/
A recurring sound heard in the heart through a stethoscope that may indicate a problem with a heart valve.
Muscle
/ˈmʌsəl/
A band or bundle of fibrous tissue in a human or animal body that has the ability to contract.
Muscle tone
/ˈmʌsəl toʊn/
The continuous and passive partial contraction of the muscles; tonus.
Muscular dystrophy
/ˈmʌskjʊlər ˈdɪstrəfi/
A hereditary condition marked by progressive weakening and wasting of the muscles.
Musculoskeletal
/ˌmʌskjʊloʊˈskɛlɪtəl/
Relating to both the muscles and the skeleton.
Mustard gas
/ˈmʌstərd ɡæs/
A cytotoxic and blister agent used in chemical warfare, leading to severe skin and lung damage.
Mutagen
/ˈmjuːtədʒən/
An agent, such as radiation or a chemical substance, which causes genetic mutation.
Mutation
/mjuːˈteɪʃən/
The changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations.
Mutism
/ˈmjuːtɪzəm/
Inability or refusal to speak, often due to psychological or neurological factors.
Myalgia
/maɪˈældʒə/
Pain in a muscle or group of muscles.
Myasthenia
/ˌmaɪəsˈθiːniə/
Muscle weakness.
Myasthenia gravis
/ˌmaɪəsˈθiːniə ˈɡrævɪs/
A condition causing abnormal muscle weakness without atrophy, and which is caused by a defect in nerve impulse transmission.
Mycobacterium
/ˌmaɪkoʊbækˈtɪəriəm/
A genus of bacteria that includes the causative agents of tuberculosis and leprosy.
Mycology
/maɪˈkɒlədʒi/
The scientific study of fungi.
Mydriasis
/mɪˈdraɪəsɪs/
Dilation of the pupil of the eye.
Mydriatic
/ˌmɪdriˈætɪk/
A drug that causes the pupil of the eye to dilate.
Myelencephalon
/ˌmaɪəlɛnˈsɛfəlɒn/
The posterior part of the developing vertebrate hindbrain; becomes the medulla oblongata.
Myelin
/ˈmaɪəlɪn/
A mixture of proteins and phospholipids forming a whitish insulating sheath around many nerve fibers.
Myelin sheath
/ˈmaɪəlɪn ʃiːθ/
An insulating layer that forms around nerves, allowing electrical impulses to transmit quickly.
Myelitis
/ˌmaɪəˈlaɪtɪs/
Inflammation of the spinal cord or of the bone marrow.
Myelocele
/ˈmaɪəloʊsiːl/
A protrusion of the spinal cord through a defect in the vertebral column.
Myelofibrosis
/ˌmaɪəloʊfaɪˈbroʊsɪs/
A rare type of bone marrow cancer that disrupts the normal production of blood cells.
Myelography
/ˌmaɪəˈlɒɡrəfi/
A diagnostic imaging test using a contrast medium to detect pathology of the spinal cord.
Myeloma
/ˌmaɪəˈloʊmə/
A malignant tumor of the bone marrow.
Myelosuppression
/ˌmaɪəloʊsəˈprɛʃən/
A condition in which bone marrow activity is decreased, resulting in fewer red blood cells, white blood cells, and platelets.
Myocardial
/ˌmaɪoʊˈkɑːrdiəl/
Relating to the muscular tissue of the heart (myocardium).
Myocardial infarction
/ˌmaɪoʊˈkɑːrdiəl ɪnˈfɑːrkʃən/
Commonly known as a heart attack; the death of heart muscle due to blocked blood flow.
Myocarditis
/ˌmaɪoʊkɑːrˈdaɪtɪs/
Inflammation of the heart muscle.
Myoclonus
/maɪˈɒklənəs/
Spasmodic jerky contraction of groups of muscles.
Myofibril
/ˌmaɪoʊˈfaɪbrɪl/
Any of the elongated contractile threads found in striated muscle cells.
Myoma
/maɪˈoʊmə/
A benign tumor of muscular tissue.
Myometrium
/ˌmaɪoʊˈmiːtriəm/
The muscular middle layer of the wall of the uterus.
Myopathy
/maɪˈɒpəθi/
A disease of muscle tissue.
Myopia
/maɪˈoʊpiə/
Nearsightedness; a condition in which close objects appear clearly, but far ones don't.
Myopic
/maɪˈɒpɪk/
Relating to or affected by nearsightedness.
Myorrhaphy
/maɪˈɔːrəfi/
Surgical suturing of a muscle.
Myosin
/ˈmaɪəsɪn/
A fibrous protein that forms the contractile filaments of muscle cells.
Myotomy
/maɪˈɒtəmi/
Surgical incision or cutting of a muscle.
Myringitis
/ˌmɪrɪnˈdʒaɪtɪs/
Inflammation of the tympanic membrane (eardrum).
Myringotomy
/ˌmɪrɪŋˈɡɒtəmi/
Surgical incision into the eardrum, typically to relieve pressure or drain fluid.
Myxedema
/ˌmɪksɪˈdiːmə/
Swelling of the skin and underlying tissues giving a waxy appearance, typical of severe hypothyroidism.
Myxoma
/mɪkˈsoʊmə/
A benign tumor of connective tissue containing mucous material.
Ménière's disease
/mɛniˈɛərz dɪˈziːz/
A disorder of the inner ear that causes episodes of vertigo, tinnitus, and hearing loss.
Nuchal
/ˈnjuːkəl/
Relating to the nape (back) of the neck.