U-wave
/ˈjuː weɪv/
A small deflection on an ECG following the T-wave, sometimes seen in hypokalemia.
Ubiquitin
/juːˈbɪkwɪtɪn/
A protein found in nearly all eukaryotic cells that helps regulate the processes of other proteins.
Ulcerative colitis
/ˈʌlsərətɪv koʊˈlaɪtɪs/
A chronic inflammatory bowel disease (IBD) that causes inflammation and ulcers in the digestive tract.
Ulna, Styloid process of
/ˈʌlnə ˈstaɪlɔɪd ˈprɒsɛs/
The bony projection at the end of the ulna near the wrist.
Ulnar artery
/ˈʌlnər ˈɑːrtəri/
The main blood vessel supplying the medial aspect of the forearm and hand.
Ulnar bursa
/ˈʌlnər ˈbɜːrsə/
A synovial sheath in the palm of the hand.
Ulnar collateral ligament
/ˈʌlnər kəˈlætərəl ˈlɪɡəmənt/
A thick triangular band at the medial aspect of the elbow or thumb.
Ulnar deviation
/ˈʌlnər ˌdiːviˈeɪʃən/
A hand deformity where the fingers drift toward the little finger; common in rheumatoid arthritis.
Ultimobranchial body
/ˌʌltɪmoʊˈbræŋkiəl ˈbɒdi/
An embryonic structure that gives rise to the C cells of the thyroid gland.
Ultracentrifuge
/ˌʌltrəˈsɛntrɪfjuːdʒ/
A high-speed centrifuge used to separate very small particles like viruses and proteins.
Ultradian
/ʌlˈtreɪdiən/
Referring to cycles or periods that occur more than once a day (e.g., certain hormone releases).
Ultrafiltration
/ˌʌltrəfɪlˈtreɪʃən/
A process of filtration under pressure; the mechanism by which the kidneys produce primary urine.
Ultrasonic nebulizer
/ˌʌltrəˈsɒnɪk ˈnɛbjʊlaɪzər/
A device that uses high-frequency sound waves to turn liquid medication into a mist for inhalation.
Ultrasonics
/ˌʌltrəˈsɒnɪks/
The branch of science dealing with ultrasonic waves.
Ultrastructure
/ˈʌltrəˌstrʌktʃər/
The detailed structure of a biological specimen, such as a cell, as seen with an electron microscope.
Ultraviolet A (UVA)
/ˌʌltrəˈvaɪələt eɪ/
Long-wave UV radiation that penetrates deep into the skin, causing aging and contributing to skin cancer.
Ultraviolet B (UVB)
/ˌʌltrəˈvaɪələt biː/
Short-wave UV radiation that causes sunburn and is the primary cause of skin cancer.
Umbilical artery
/ʌmˈbɪlɪkəl ˈɑːrtəri/
One of a pair of arteries in the umbilical cord that carries deoxygenated blood from the fetus to the placenta.
Umbilical hernia
/ʌmˈbɪlɪkəl ˈhɜːrniə/
A condition where abdominal contents bulge through the abdominal wall at the navel.
Umbilical vein
/ʌmˈbɪlɪkəl veɪn/
The vessel in the umbilical cord that carries oxygenated, nutrient-rich blood from the placenta to the fetus.
Umbilication
/ʌmˌbɪlɪˈkeɪʃən/
A depression resembling a navel, often seen in the center of certain skin lesions (e.g., molluscum contagiosum).
Unasyn
/ˈʌnəsɪn/
Brand name for a combination of ampicillin and sulbactam, used to treat bacterial infections.
Uncal herniation
/ˈʌŋkəl ˌhɜːrniˈeɪʃən/
A life-threatening type of brain herniation where part of the temporal lobe is pushed through the tentorial notch.
Uncinate
/ˈʌnsɪnət/
Hooked or having a hook-like process (e.g., uncinate process of the pancreas).
Uncompensation
/ˌʌnkɒmpɛnˈseɪʃən/
The failure of a system (like the heart or lungs) to correct for an abnormality, leading to severe symptoms.
Unconsciousness
/ʌnˈkɒnʃəsnəs/
The state of being unconscious; lack of awareness.
Uncus
/ˈʌŋkəs/
A hook-shaped part of the brain, located at the front end of the hippocampal gyrus.
Underweight
/ˈʌndərweɪt/
A body weight below what is considered healthy (typically a BMI under 18.5).
Undifferentiated
/ˌʌndɪfəˈrɛnʃieɪtɪd/
Lacking specialized structures or functions; often used to describe aggressive cancer cells.
Undulant fever
/ˈʌndʒʊlənt/
Brucellosis; a bacterial infection from animals characterized by a temperature that rises and falls like a wave.
Unguent
/ˈʌŋɡwənt/
A soft, greasy substance used as an ointment or for lubrication.
Unguiculate
/ʌŋˈɡwɪkjʊleɪt/
Relating to or having nails or claws.
Unguinal
/ˈʌŋɡwɪnəl/
Pertaining to the nail (fingernail or toenail).
Uniaxial
/ˌjuːniˈæksiəl/
In anatomy, a joint that moves around only one axis (e.g., a hinge joint).
Unicellular
/ˌjuːnɪˈsɛljʊlər/
Consisting of a single cell.
Unicentric
/ˌjuːnɪˈsɛntrɪk/
Originating from a single center (e.g., a tumor found in only one location).
Unicinate process
/ˈʌnsɪneɪt ˈproʊsɛs/
A hook-like projection of the ethmoid bone in the nasal cavity or the head of the pancreas.
Unifocal
/ˌjuːnɪˈfoʊkəl/
Arising from one focus or point of origin.
Unigravida
/ˌjuːnɪˈɡrævɪdə/
A woman who is pregnant for the first time.
Union
/ˈjuːnjən/
The healing together of the ends of a broken bone or the edges of a wound.
Unipara
/juːˈnɪpərə/
A woman who has given birth to only one child.
Unit of blood
/ˈjuːnɪt əv blʌd/
A standard volume of blood (approximately 450-500 mL) collected during a donation.
Unitary
/ˈjuːnɪtəri/
Relating to a single unit or acting as a single entity (e.g., unitary smooth muscle).
Universal donor
/ˌjuːnɪˈvɜːrsəl ˈdoʊnər/
A person with type O negative blood, which can be given to patients of any blood type.
Universal recipient
/ˌjuːnɪˈvɜːrsəl rɪˈsɪpiənt/
A person with type AB positive blood, who can receive blood of any type.
Unmyelinated
/ˌʌnˈmaɪəlɪneɪtɪd/
Nerve fibers that lack a myelin sheath, resulting in slower conduction of nerve impulses.
Unsaturated fat
/ʌnˈsætʃəreɪtɪd fæt/
A type of fat containing a high proportion of fatty acid molecules with at least one double bond, considered healthier in the diet.
Unstriated muscle
/ˌʌnˈstraɪeɪtɪd ˈmʌsəl/
Another name for smooth muscle.
Upper airway
/ˈʌpər ˈɛərweɪ/
The part of the respiratory system including the nose, mouth, pharynx, and larynx.
Upper GI series
/ˈʌpər ˌdʒiː ˈaɪ ˈsɪəriːz/
An X-ray exam of the esophagus, stomach, and first part of the small intestine.
Upper motor neuron
/ˈʌpər ˈmoʊtər ˈnjʊərɒn/
Nerve cells that originate in the motor cortex of the brain and travel down the spinal cord.
Urachus
/ˈjʊərəkəs/
A fibrous remnant of the allantois, connecting the bladder to the umbilicus.
Uracil
/ˈjʊərəsɪl/
One of the four nucleobases in the nucleic acid of RNA.
Uracil-DNA glycosylase
/ˈjʊərəsɪl/
An enzyme that plays a key role in DNA repair by removing damaged bases.
Uranisco-
/jʊəˈrænɪskoʊ/
A prefix relating to the palate.
Uranoplasty
/jʊəˈrænəˌplæsti/
Plastic surgery of the palate, typically to repair a cleft palate.
Uranostaphyloschisis
/jʊəˌrænoʊˌstæfɪˈlɒskɪsɪs/
A cleft involving both the hard and soft palates.
Uranyl
/ˈjʊərənɪl/
A bivalent radical (UO2) often found in specific medical laboratory compounds.
Urate
/ˈjʊəreɪt/
A salt of uric acid; high levels in the blood lead to the formation of crystals in joints (gout).
Urea cycle
/jʊˈriːə ˈsaɪkəl/
A cycle of biochemical reactions that produces urea from ammonia to detoxify the body.
Ureapoiesis
/jʊəˌriːəpɔɪˈiːsɪs/
The formation or production of urea.
Urease
/ˈjʊərieɪs/
An enzyme that catalyzes the hydrolysis of urea into carbon dioxide and ammonia.
Ureido-
/jʊəˈriːɪdoʊ/
A chemical prefix relating to urea or the ureido group.
Uremia, Chronic
/jʊˈriːmiə ˈkrɒnɪk/
A long-term condition of high urea levels in the blood due to kidney failure.
Uremic encephalopathy
/jʊˈriːmɪk ɛnˌsɛfəˈlɒpəθi/
Brain dysfunction caused by the accumulation of toxins from kidney failure.
Ureteralgia
/jʊˌriːtəˈrældʒə/
Pain in the ureter.
Ureterectasia
/jʊˌriːtərɛkˈteɪʒə/
Dilation or distention of a ureter.
Ureterectomy
/jʊˌriːtəˈrɛktəmi/
Surgical removal of all or part of a ureter.
Ureteric bud
/jʊəˈrɛtərɪk bʌd/
An embryonic protrusion that eventually develops into the ureter and the collecting system of the kidney.
Ureteritis
/jʊˌriːtəˈraɪtɪs/
Inflammation of the ureter.
Uretero-
/jʊˈriːtəroʊ/
A prefix relating to the ureter.
Ureterocele
/jʊˈriːtərəˌsiːl/
A swelling at the end of the ureter as it enters the bladder.
Ureterocelectomy
/jʊˌriːtəroʊsɛˈlɛktəmi/
Surgical excision of a ureterocele.
Ureterocolostomy
/jʊˌriːtəroʊkəˈlɒstəmi/
Surgical transplantation of the ureter into the colon.
Ureterocystoneostomy
/jʊˌriːtəroʊˌsɪstoʊniˈɒstəmi/
Surgical reimplantation of a ureter into the bladder.
Ureteroileostomy
/jʊˌriːtəroʊˌɪliˈɒstəmi/
Implantation of the ureters into an isolated segment of the ileum (ileal conduit).
Ureterolith
/jʊˈriːtərəˌlɪθ/
A stone in the ureter.
Ureterolithotomy
/jʊˌriːtəroʊlɪˈθɒtəmi/
Surgical removal of a stone from the ureter.
Ureterolysis
/jʊˌriːtəˈrɒlɪsɪs/
Surgical procedure to free the ureter from surrounding adhesions or inflammatory tissue.
Ureteropelvic junction (UPJ)
/jʊˌriːtəroʊˈpɛlvɪk/
The point where the renal pelvis of the kidney joins the ureter.
Ureteroplasty
/jʊˈriːtərəˌplæsti/
Plastic surgery of the ureter.
Ureteropyelitis
/jʊˌriːtəroʊˌpaɪəˈlaɪtɪs/
Inflammation of both the ureter and the renal pelvis.
Ureteropyelonephritis
/jʊˌriːtəroʊˌpaɪəloʊnɪˈfraɪtɪs/
Inflammation involving the ureter, renal pelvis, and the kidney itself.
Ureterosigmoidostomy
/jʊˌriːtəroʊsɪɡmɔɪˈdɒstəmi/
Surgical diversion of urine where the ureters are connected to the sigmoid colon.
Ureterostomy
/jʊˌriːtəˈrɒstəmi/
Surgical creation of an opening from the ureter to the surface of the body.
Ureterovesical junction (UVJ)
/jʊˌriːtəroʊˈvɛsɪkəl/
The point where the ureter enters the urinary bladder.
Ureterovesical valve
/jʊˌriːtəroʊˈvɛsɪkəl vælv/
The anatomical arrangement that prevents the backflow of urine from the bladder into the ureters.
Urethan
/ˈjʊərəθæn/
Ethyl carbamate; a compound formerly used in the treatment of some cancers.
Urethral stricture
/jʊˈriːθrəl ˈstrɪktʃər/
Narrowing of the urethra caused by injury, instrumentation, or infection.
Urethralgia
/ˌjʊərɪˈθrældʒə/
Pain in the urethra.
Urethro-
/jʊˈriːθroʊ/
A prefix relating to the urethra.
Urethrocele
/jʊˈriːθrəˌsiːl/
Prolapse of the female urethra into the vagina.
Urethroperineal
/jʊˌriːθroʊˌpɛrɪˈniːəl/
Relating to the urethra and the perineum.
Urethroplasty
/jʊˈriːθrəˌplæsti/
Surgical repair of the urethra.
Urethrorrhagia
/jʊˌriːθrəˈreɪdʒə/
Hemorrhage (bleeding) from the urethra.
Urethrorrhea
/jʊˌriːθrəˈriːə/
Abnormal discharge from the urethra.
Urethroscope
/jʊˈriːθrəˌskoʊp/
An endoscope for viewing the interior of the urethra.
Urethrovaginal
/jʊˌriːθroʊˈvædʒɪnəl/
Relating to both the urethra and the vagina.
Urgencies, hypertensive
/ˈɜːrdʒənsiz ˌhaɪpərˈtɛnsɪv/
Severe elevation of blood pressure without evidence of end-organ damage.
Urgency
/ˈɜːrdʒənsi/
A sudden, strong need to urinate.
Urhidrosis
/ˌjʊərhiˈdroʊsɪs/
The excretion of urea or other urinary components in the sweat.
Uricaciduria
/ˌjʊərɪkˌæsɪˈdjʊəriə/
Excretion of excessive amounts of uric acid in the urine.
Uricemia
/ˌjʊərɪˈsiːmiə/
The presence of uric acid in the blood.
Uricolysis
/ˌjʊərɪˈkɒlɪsɪs/
The breakdown or destruction of uric acid.
Uricolysis, Hepatic
/ˌjʊərɪˈkɒlɪsɪs hɪˈpætɪk/
The breakdown of uric acid occurring in the liver.
Uridrosis
/ˌjʊərɪˈdroʊsɪs/
The presence of urea in the sweat.
Uridrosis crystallina
/ˌjʊərɪˈdroʊsɪs krɪstəˈlaɪnə/
Uremic frost; white crystals of urea deposited on the skin in severe uremia.
Urinal
/ˈjʊərɪnəl/
A vessel for receiving urine.
Urinary cast
/ˈjʊərɪnɛri kæst/
Cylindrical structures produced by the kidney and present in the urine in certain disease states.
Urinary diversion
/ˈjʊərɪnɛri daɪˈvɜːrʒən/
A surgical procedure to create a new way for urine to leave the body when the bladder is removed or bypassed.
Urinary incontinence
/ˈjʊərɪnɛri ɪnˈkɒntɪnəns/
The involuntary leakage of urine; inability to control the bladder.
Urinary meatus
/ˈjʊərɪnɛri miˈeɪtəs/
The external opening of the urethra.
Urinary retention
/ˈjʊərɪnɛri rɪˈtɛnʃən/
The inability to completely empty the bladder.
Urination
/ˌjʊərɪˈneɪʃən/
Micturition; the discharge of urine from the body.
Urine
/ˈjʊərɪn/
A watery, typically yellowish fluid stored in the bladder and discharged through the urethra.
Urine, residual
/ˈjʊərɪn rəˈzɪdʒuəl/
Urine that remains in the bladder after a person has urinated.
Uriniferous
/ˌjʊərɪˈnɪfərəs/
Pertaining to the conveyance or production of urine (e.g., uriniferous tubules in the kidney).
Urinoma
/ˌjʊərɪˈnoʊmə/
A collection of extravasated urine, typically found in the retroperitoneal space.
Urinometer
/ˌjʊərɪˈnɒmɪtər/
A small instrument used to measure the specific gravity of urine.
Urobiliary
/ˌjʊəroʊˈbɪliˌɛri/
Pertaining to both urine and bile.
Urobilin
/ˌjʊəroʊˈbaɪlɪn/
A brown pigment in urine that is a breakdown product of bilirubin.
Urobilinogen
/ˌjʊəroʊbaɪˈlɪnədʒən/
A colorless compound formed in the intestines by bacterial action on bilirubin.
Urocele
/ˈjʊərəˌsiːl/
A swelling of the scrotum containing urine.
Urochrome
/ˈjʊərəˌkroʊm/
The yellow pigment that gives urine its normal color.
Urodynamic testing
/ˌjʊəroʊdaɪˈnæmɪk/
Procedures that look at how well the bladder, sphincters, and urethra are storing and releasing urine.
Uroflowmetry
/ˌjʊəroʊˈfloʊmɪtri/
A simple test that measures the volume of urine released from the body, the speed with which it is released, and how long the release takes.
Urogenital
/ˌjʊəroʊˈdʒɛnɪtəl/
Relating to both the urinary and genital organs.
Urogenital sinus
/ˌjʊəroʊˈdʒɛnɪtəl ˈsaɪnəs/
An embryonic cavity from which the urinary and genital tracts develop.
Urography
/jʊˈrɒɡrəfi/
Radiographic visualization of the urinary tract using a contrast medium.
Urokinase
/ˌjʊəroʊˈkaɪneɪs/
An enzyme found in urine that acts as a thrombolytic agent to dissolve blood clots.
Urolithiasis
/ˌjʊəroʊlɪˈθaɪəsɪs/
The formation of stony concretions (calculi) in the bladder or urinary tract.
Urologist
/jʊˈrɒlədʒɪst/
A physician who specializes in diseases of the urinary tract and the male reproductive system.
Urology
/jʊˈrɒlədʒi/
The branch of medicine and physiology concerned with the function and disorders of the urinary system.
Uromucoid
/ˌjʊəroʊˈmjuːkɔɪd/
A mucoprotein found in urine.
Uropathy
/jʊˈrɒpəθi/
Any disease or abnormal condition affecting the urinary tract.
Uroradiology
/ˌjʊəroʊˌreɪdiˈɒlədʒi/
Radiology specifically focused on the urinary tract.
Urosepsis
/ˌjʊəroʊˈsɛpsɪs/
Sepsis (blood poisoning) resulting from an infection in the urinary tract.
Urostomy
/jʊˈrɒstəmi/
A surgical opening that diverts urine away from the bladder that is diseased or not working properly.
Urotoxin
/ˌjʊəroʊˈtɒksɪn/
Any toxic substance found in the urine.
Ursodeoxycholic acid
/ˌɜːrsoʊdiˌɒksɪˈkoʊlɪk ˈæsɪd/
A bile acid used as a drug to dissolve gallstones and treat certain liver diseases.
Urticaria
/ˌɜːrtɪˈkɛəriə/
Hives; a skin rash with pale red, raised, itchy bumps.
Urtication
/ˌɜːrtɪˈkeɪʃən/
The development of hives or a sensation like being stung by nettles.
Usurpation
/ˌjuːzərˈpeɪʃən/
In cardiology, a condition where a secondary pacemaker takes over the heart's rhythm from the natural SA node.
Uterine
/ˈjuːtəraɪn/
Relating to the uterus or womb.
Uterine appendages
/ˈjuːtəraɪn əˈpɛndɪdʒɪz/
The fallopian tubes and ovaries.
Uterine prolapse
/ˈjuːtəraɪn ˈproʊlæps/
A condition where the uterus slides down into or protrudes out of the vagina due to weakened pelvic floor muscles.
Uterine souffle
/ˈjuːtəraɪn ˈsuːfəl/
A soft, blowing sound heard through a stethoscope over the pregnant uterus, caused by blood circulating through the placenta.
Uterine tubes
/ˈjuːtəraɪn tuːbz/
Another name for the Fallopian tubes, which transport the egg from the ovary to the uterus.
Uterocele
/ˈjuːtərəˌsiːl/
Herniation or protrusion of the uterus.
Uterofixation
/ˌjuːtəroʊfɪkˈseɪʃən/
The surgical fixation of a displaced uterus; also known as hysteropexy.
Uterogestation
/ˌjuːtəroʊdʒɛˈsteɪʃən/
The normal process of pregnancy within the uterus.
Uterography
/ˌjuːtəˈrɒɡrəfi/
X-ray examination of the uterus.
Uteropexy
/ˈjuːtərəˌpɛksi/
Surgical fixation of the uterus to the abdominal wall or other support.
Uteroplacental
/ˌjuːtəroʊpləˈsɛntəl/
Relating to the communication between the uterus and the placenta.
Uterosacral ligament
/ˌjuːtəroʊˈseɪkrəl/
Part of the peritoneal fold that supports the uterus, extending from the cervix to the sacrum.
Uterosalpingography
/ˌjuːtəroʊˌsælpɪŋˈɡɒɡrəfi/
Radiographic imaging of the uterus and fallopian tubes.
Uterotonic
/ˌjuːtəroʊˈtɒnɪk/
An agent used to induce contraction or greater tonicity of the uterus, often to prevent postpartum hemorrhage.
Uterovaginal
/ˌjuːtəroʊˈvædʒɪnəl/
Relating to both the uterus and the vagina.
Uterovesical
/ˌjuːtəroʊˈvɛsɪkəl/
Relating to both the uterus and the urinary bladder.
Uterus
/ˈjuːtərəs/
The womb; a hollow muscular organ in the pelvic cavity of females in which the embryo is nourished and develops before birth.
Utilization review
/ˌjuːtɪlɪˈzeɪʃən rɪˈvjuː/
The critical appraisal of the necessity, efficiency, and appropriateness of healthcare services.
Utricle
/ˈjuːtrɪkəl/
The larger of the two sacs in the membranous labyrinth of the inner ear, involved in sensing gravity and movement.
Utriculitis
/jʊˌtrɪkjʊˈlaɪtɪs/
Inflammation of the utricle (in the inner ear or the prostatic utricle).
Uvea
/ˈjuːviə/
The pigmented layer of the eye, lying beneath the sclera and cornea, comprising the iris, ciliary body, and choroid.
Uveal tract
/ˈjuːviəl trækt/
The middle layer of the eye, including the iris, ciliary body, and choroid.
Uveitis
/ˌjuːviˈaɪtɪs/
Inflammation of the uvea, causing pain and redness.
Uveitis, Anterior
/ˌjuːviˈaɪtɪs ænˈtɪəriər/
Inflammation of the iris (iritis) or the iris and ciliary body (iridocyclitis).
Uveitis, Posterior
/ˌjuːviˈaɪtɪs pɒˈstɪəriər/
Inflammation of the choroid or the retina at the back of the eye.
Uveoparotitis
/ˌjuːvioʊpəˌrɒtˈaɪtɪs/
Inflammation of the uvea and the parotid salivary gland; often associated with sarcoidosis.
Uveoscleral outflow
/ˌjuːvioʊˈsklɪərəl/
The drainage of ocular aqueous humor through the ciliary muscle into the suprachoroidal space.
Uvula
/ˈjuːvjʊlə/
A fleshy extension at the back of the soft palate that hangs above the throat.
Uvular
/ˈjuːvjʊlər/
Relating to the uvula.
Uvular muscle
/ˈjuːvjʊlər ˈmʌsəl/
Musculus uvulae; the muscle that moves and shapes the uvula.
Uvularia
/ˌjuːvjʊˈlɛəriə/
An old term for the uvula.
Uvulectomy
/ˌjuːvjʊˈlɛktəmi/
The surgical removal of the uvula.
Uvulectomy, Laser
/ˈleɪzər ˌjuːvjʊˈlɛktəmi/
LAUP; a procedure using a laser to remove part of the uvula and soft palate to treat snoring or sleep apnea.
Uvulitis
/ˌjuːvjʊˈlaɪtɪs/
Inflammation of the uvula.
Uvulopalatopharyngoplasty
/ˌjuːvjʊloʊˌpælətoʊfəˈrɪŋɡoʊˌplæsti/
UPPP; a surgical procedure used to treat obstructive sleep apnea by removing excess tissue in the throat.
Uvuloptosis
/ˌjuːvjʊlɒpˈtoʊsɪs/
A relaxed or sagging condition of the uvula.
Uvulotome
/ˈjuːvjʊləˌtoʊm/
An instrument used for the excision of the uvula.