Dictionary

Enter a word or phrase below to search our online dictionary of over 1,300 general medical terms, or click on a letter of the alphabet to view all terms beginning with that letter:

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Search for 'T'

Phrase Definition
tachycardia An abnormally rapid heartbeat.
tachypnea Rapid breathing.
talus A bone of the ankle.
Tanner staging A growth chart used to assess the stage of puberty based on pubic hair growth, the development of genitalia in boys and breasts in girls.
telogen effluvium Thinning hair. Rarely results in actual baldness.
temporomandibular joint TMJ. The joint between the lower jaw and the side of the head, located just in front of the ear.
tendinitis Inflammation of a tendon.
tendon A cord of strong white fibrous tissue connecting muscle to bone.
teratogen An agent that causes physical defects in a developing embryo.
testis The male gonad or reproductive organ.
testosterone One of the male sex hormones.
tetanus An infectious disease, often fatal, caused by a Clostridium tetani bacteria. The bacteria usually enters the body through wounds. Characterized by muscle spasms and convulsions. Also called lockjaw.
tetany A continuous muscle spasm.
thalassemia An inherited type of chronic anemia.
therapeutic A substance or treatment that's effective in treating disease.
thoracentesis A surgical puncture and drainage of the chest cavity.
thoracic Having to do with the chest.
thorax The chest.
thrombocyte A platelet.
thromboembolism Blockage of a blood vessel by the piece of a blood clot that has broken loose from its original site.
thrombosis Formation of a blood clot within a blood vessel or the heart.
thrush Infection of the mouth by yeast. Characterized by milky-white lesions on the mouth, lips and throat.
thymus A ductless gland located behind the upper portion of the breastbone.
thyroid gland A large endocrine gland located in the front and sides of the neck and below the Adam's apple. Essential for the regulation of growth and metabolism.
thyroxine The hormone from the thyroid gland that's essential in metabolism.
tibia The larger of two bones in the lower leg.
tic An involuntary spasm or twitching of a muscle.
tinea A general term for fungal infections of the skin, usually combined with a description of the site or cause. Examples include tinea cruris or "jock itch," and tinea pedis or "athlete's foot."
tinnitus Ringing in the ears. Sensation of a high-pitched sound that's not actually present.
tissue A group of similar cells that together perform certain specialized functions.
tongue The muscular organ attached to the floor of the mouth. Used to speak, chew, swallow and taste.
tonsillectomy A procedure to remove the tonsils.
tonsils A pair of oval masses of lymphoid tissue, one on each side of the throat at the back of the mouth.
toxemia The presence of toxic substances in the blood from bacteria or body cells.
toxic Poisonous.
trachea The air passage extending from the throat to the bronchi. Also called the windpipe.
tracheostomy A surgical incision in the trachea (the windpipe) through which a rigid tube is inserted to allow air to enter.
trachoma A chronic infectious eye disease caused by Chlamydia infection of the eye. A leading cause of blindness worldwide.
transfusion Introduction of blood or blood products through a vein into the body's circulation.
transplantation The transfer of living organs or tissue from a donor to another person or from one area in the body to another.
trauma Injury produced by an external force.
trench mouth An acute, severe bacterial infection of the gums and lining of the mouth.
triage A system of assigning priorities of medical treatment based on urgency, severity of injury and chance for survival.
triceps A muscle of the arm used to extend the forearm.
trichinosis Infection with a roundworm caused by consumption of larvae in undercooked pork or other infected meat.
trichomoniasis Infection with Trichomonas protozoa. Frequently causes vaginal itching and discharge in women. It's usually acquired by sexual contact with an infected partner.
tricuspid valve The heart valve between the right atrium and the right ventricle.
trisomy The presence of an extra chromosome in addition to the usual pair. Down syndrome is an example of a condition caused by trisomy.
truss A device to keep a hernia in its proper place.
TSH Thyroid-stimulating hormone. A pituitary hormone that stimulates thyroid hormone production.
tuberculin A protein injected into the skin to test for tuberculosis infection.
tuberculosis An infectious disease caused by bacteria and characterized by the formation of tubercles in various tissues of the body, especially of the lungs.
tumor Overgrowth of tissue.
tussis Cough.
tympanic membrane The eardrum.
typhoid fever A bacterial infection with Salmonella typhi transmitted by contaminated water, milk or other foods. Proper sanitation and hygiene prevent the spread of disease.
typhus An infectious disease spread to people by the bite of ticks, mites, fleas and lice. Typhus is characterized by high fever, headache and a rash.