380 GLOSSARY 



Thy'roid (Gr. 8vpe6s, thureos, a shield). The largest of the cartilages of 

 the larynx ; its angular projection in the front of the neck is called 

 "Adam's apple." 



Tra'che-a (Gr. rpaxtfs, trachus, rough). The windpipe, or the largest of 

 the air-passages ; composed in part of cartilaginous rings, which render 

 its surface rough and uneven. 



Trans-fu'sion (L. transfun'do, to pour from one vessel to another). The 

 operation of injecting blood taken from one person into the veins of 

 another ; other fluids than blood are sometimes used. 



Tri-chi'na Spi-ra'lis (L.). A minute species of parasite or worm, which 

 infests the flesh of the hog, and which may be introduced into the 

 human system by eating pork not thoroughly cooked. 



Tym'pa-num (Gr. Tvpiravov, tumpanon^ a drum). The cavity of the 

 middle ear, resembling a drum in being closed by two membranes, 

 and in having communication with the atmosphere. 



U're-a (Gr.). A substance secreted from the blood by the kidneys. 



U'vu-la (L. uva, a grape). The small pendulous body attached to the 

 back part of the palate. 



Vas'cu-lar (L. vas'culum, a little vessel). Pertaining to, or containing, 

 blood-vessels. 



Ve'nous (L. ve'na, a vein). Pertaining to, or contained within, a vein. 



Ven-ti-la'tion. The introduction of fresh air into "a room or building in 

 such a manner as to keep the air within it in a pure condition. 



Ven-tril'o-quism (L. ven'ter, the belly, and lo'quor, to speak). A modifi- 

 cation of natural speech by which the voice is made to appear to come 

 from a distance. The ancients supposed that the voice was formed in 

 the belly ; hence the name. 



Ven'tri-cles of the heart. The two largest cavities of the heart, situated 

 at its apex or point. 



Ver'te-bral Column (L. ver'te-bra, a joint). The back-bone, consisting of 

 twenty-six separate bones, called vertebrae, firmly jointed together ; 

 also called the spinal column and spine. 



Ves'ti-bule. A portion of the internal ear, communicating with the semi- 

 circular canals and the cochlea ; so called from its fancied resemblance 

 to the vestibule or porch of a house. 



Vil'li (L. vil'lus, the nap of cloth). Minute thread-like projections found 

 upon the internal surface of the small intestine, giving it a velvety 

 appearance. 



Vit're-ous (L. vi'trum, glass). Having the appearance of glass; applied 

 to the humor occupying the largest part of the cavity of the eyeball. 



Viv-i-sec'tion (L. vi'vus, alive, and se'eo, to cut). The practice of oper- 

 ating upon living animals, for the purpose of studying some 

 physiological process. 



Vocal Cords. Two elastic bands or ridges situated in the larynx ; they 

 are the essential parts of the organs of the voice. 



