238 GLOSSARY 



Immunity The resistance of the body to illness. See 

 p. 71 for kinds. Related words: to immunize, immunization, 

 immune. 



Infective Any material carrying disease viruses. 



Inhibit Restrain, limit. 



Inject To put anything within the body; in this book 

 it usually means to put beneath the skin. 



Inoculate To put some infective material within the 

 body; usually used in experimental work upon lower animals. 



Inorganic Of the mineral world and not necessarily 

 associated with living matter; example, salt. See Organic. 



Isolate Used to indicate the procuring of germs from 

 morbid fluids or to the obtaining of a single kind, a pure 

 culture, usually by finding one type of colony. Related word : 

 isolation. 



Lesion Used to indicate any physical change from normal. 

 Leukocytes The colorless, so-called white cells of the 

 blood. 



Medium (pi., Media) General name given to foodstuffs 

 upon which bacteria are grown artificially. 



Micrococcus The germs of spherical organisms dividing 

 in two planes. 



Morphology A study of the physical nature, size, and 

 shape of any object. Adj., morphological. 



Nucleus (pi., Nuclei) A mass within a cell clearly out- 

 lined from and denser than the cytoplasm or protoplasm, 

 and in which the reproductive powers of the cell probably lie. 



-ology A suffix meaning a "study of" the root, such as 

 morphology, which see. 



Opsonins Substances in the blood serum which prepare 

 foreign bodies, usually bacteria, for consumption by the 

 white cells of the blood, the phagocytes. 



Optimum The best, most suitable. 



