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GLOSSARY. 
Necrosis. The death of tissue. 
Negri bodies. Minute bodies found in the brain of persons 
and animals infected with rabies. 
Nucleus (pi. nuclei). The spherical body found in cells which 
controls its life and activity. 
Opsonin. A substance in the blood-serum which makes bac¬ 
teria more easily absorbed by the leucocytes. 
Orchitis. An inflammation of the testicle. 
Organic. Relating to substances derived from living or¬ 
ganisms. 
Osteomyelitis. An inflammation of the medullary cavicy 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. 
