138 GLOSSARY. 



Orchitis. An inflammation of the testicle. 



Organic. Relating to substances derived from living or- 

 ganisms. 



Osteomyelitis. An inflammation of the medullary cavity of 

 bone. 



Otitis media. An inflammation of the middle ear. 



Papule. A small, solid elevation of the skin. 



Parasite. A plant or animal that lives on or in another living 

 organism. 



Pasteurization, The arrest of bacterial growth by heat. 



Pathogenic. Disease-producing. 



Phagocyte. The white blood-corpuscle of the blood that en- 

 velops and destroys bacteria. 



Pericarditis. An inflammation of the covering of the heart. 



Pseudopod. A transient protrusion of the protoplasm of an 

 ameba. 



Protozoon (pi. protozoa). A unicellular animal organism. 



Prophylaxis. The prevention of disease. 



Pyogenic. Pus-producing. 



Puerperal fever. An infection starting in the uterus after 

 childbirth. 



Pustule. A small elevation of the skin containing pus. 



Quarantine. Isolation on account of suspected contagious 

 disease. 



Saprophyte. An organism capable of living on dead matter. 



Septicemia. The condition resulting from the invasion of the 

 body by bacteria and the absorption of the poisons pro- 

 duced by them. 



Spirochete. A spiral or corkscrew-shaped organism. 



Sterile. Free from micro-organisms. 



Suppuration. The formation of pus. 



Tenesmus. Ineffectual straining at stool. 

 Tuberculin. A preparation made from tubercle bacilli and 

 containing their toxins. 



