GLOSSARY 455 



Tox'in (Gr. toxikon, arrow poison), a virulent poison formed within a 

 living body. Most toxins are ptomaines. 



Tra'che-a (Gr. trachus, rough), the windpipe ; rings of cartilage make 

 its outside irregular and rough. 



Trans-fu'sion (Lat. trans, across, and /under ~e, to pour out), transferring 

 blood from the veins of one person into the veins of another. 



Tri'ceps (Lat. tri, three, and caput, head), the muscle extending down 

 the back of the arm from the shoulder to the elbow. It straightens 

 the elbow. Its upper end has three branches. 



Trichinae (trick-i 1 nee) (Gr. thrix, a hair), microscopic worms which 

 live in the muscles of a pig. They sometimes remain alive in par- 

 tially cooked pork, and if eaten produce a deadly disease. 



Tri-cus'pid valve (Lat. tres, three, and cuspis, point), the valve between 

 the right auricle and ventricle ; it is formed of three leaves. 



Tryp-sin (Gr. tribein, to rub), the ferment of the pancreatic juice which 

 digests albumin. 



Tu-ber-cu-lo'sis (Lat. tuberculum, a little lump), a disease in which 

 small white lumps like pinheads form in the flesh. Later, these 

 soften and run out as matter. The disease is commonly called con- 

 sumption. 



Tym'pa-num (Lat. tympanum, drum), the middle ear. 



Ty'phoid fever (Gr. tuphos, a cloud, and hence a stupor arising from 

 fever, and eidos, form), a tedious and weakening fever caused by the 

 growth of a kind of bacteria. 



Ty-ro-tox'i-con (Gr. turos, cheese, and toxicon, poison), a virulent 

 ptomaine poison sometimes found in cheese and other substances 

 made from milk. 



Ul'na (Lat. ulna, the elbow), the bone on the little finger side of the 



lower arm. 

 U're-a (Gr. our on, urine), a very soluble crystalline substance, one of 



the three principal waste products of the body. It is the essential 



part of urine. 

 U-re'ter (Gr. our on, urine), the tube leading from the kidney to the 



bladder. 



Vac-cin-a'tion (Lat. vacca, a cow), the introduction of the germs of 

 cowpox into the skin for the purpose of causing the disease as a 

 protection against smallpox. 



