he largest of the
cartilages of the larynx: its projection in front is called "Adam's
Apple."

Tissue. Any substance or texture in the body formed of various elements,
such as cells, fibers, blood-vessels, etc., interwoven with each other.

Tobacco (Indian _tabaco_, the tube, or pipe, in which the Indians smoked
the plant). A plant used for smoking and chewing, and in snuff.

Trachea (Gr. trachys, rough). The windpipe.

Tragus (Gr. tragos, a goat). The eminence in front of the opening of the
ear; sometimes hairy, like a goat's beard.

Transfusion (Lat. _transfundo_, to pour from one vessel to another). The
operation of injecting blood taken from one person into the veins of
another.

Trichina Spiralis. (A twisted hair). A minute species of parasite, or
worm, which infests the flesh of the hog: may be introduced into the human
system by eating pork not thoroughly cooked.

Trochanter (Gr. trochao, to turn, to revolve). Name given to two
projections on the upper extremities of the femur, which give attachment
to the _rotator_ muscles of the thigh.

Trypsin. The ferment principle in pancreatic juice, which converts proteid
material into peptones.

Tubercle (Lat. _tuber_, a bunch). A pimple, swelling, or tumor. A morbid
product occurring in certain lung diseases.

Tuberosity (Lat. _tuber, tuberis_, a swelling). A protuberance.

Turbinated (Lat. _turbinatus_, from _turbo, turbinis_, a top). Formed like
a _top_; a name given to the bones in the outer wall of the nasal fossae.

Tympanum (Gr. _tympanon_, a drum). The cavity of the middle ear,
resembling a drum in being closed by two membranes.

Umbilicus (Lat., the navel.) A round cicatrix or scar in the median line
of the abdomen.

Urea (Lat. _urina_, urine). Chief solid constitutent of _urine_.
Nitrogenous product of tissue decomposition.

Ureter (Gr. _oureo_, to pass urine). The tube through which the _urine_ is
conveyed from the kidneys to the bladder.

Uvula (Lat. _uva_, a grape). The small, pendulous body attached to the
back part of the palate.

Vaccine Virus (Lat. _vacca_, a cow, and _virus_, poison). The material
derived from heifers for the purpose of vaccination,--the great preventive
of smallpox.

Valvulae Conniventes. A name given to transverse folds of the mucous
membrane in the small intestine.

Varicose (Lat. _varix_, a dilated vein). A distended or enlarged vein.

Vascular (Lat. _vasculum_, a little vessel). Pertaining to or possessi