T..

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T Cell
white blood cell critical to the immune response. 
Tachyarrhythmia
a distrubance of the heart's rhythym resulting in a heart rate of over 100 beats per minute
Tendons
Tough, fibrous cords of tissue that connect muscle to bone.
Tenesmus
Straining to have a bowel movement. 
Thrombosis
The formation of a mass of aggregated blood factors (thrombus); coagulation of the blood; the formation, development, or presence of a thrombus.
Tracheoesophageal Fistula (TEF)
A condition that occurs when there is a gap between the upper and lower segments of the esophagus. Food and saliva cannot pass through.
Transverse Colon
The part of the colon that goes across the abdomen from right to left.
Travelers' Diarrhea
An infection caused by unclean food or drink. Often occurs during travel outside one's own country. 
Triglyceride
A type of blood fat
Tropical Sprue
A condition of unknown cause. Abnormalities in the lining of the small intestine prevent the body from absorbing food normally.