222 GLOSSARY 



Bacillus (pi., Bacilli) The genus of motile rods. 



Bacteriaceae The family of rod-shaped bacteria. 



Bactericide A substance used to kill bacteria; also called 

 a " germicide." Related word: bactericidal. 



Bacterins The dead bodies of bacteria used to treat 

 disease by injection under the skin; also called "vaccines." 



Bacteriolysin An antibody that will dissolve bacteria. 

 Related words: bacteriolysis, bacteriolytic. 



Bacteriology The study of bacteria. Adj., bacterio- 

 logical. 



Bacterium (pi. Bacteria) From Greek word meaning little 

 stick; the genus of non-motile rods. The words are also used 

 to mean any of these lowest plants. 



Carrier A term applied to a person who carries germs 

 capable of being transmitted to and infecting others, but 

 himself not suffering at the time from the disease caused by 

 the germ. 



Cell The smallest recognizable unit in biology. Cells are 

 single and independent in bacteria and protozoa, but are 

 combined and dependent upon one another in the higher 

 plants and animals. 



Coccacese The family of the spherical organisms. 



Coccus (pi., Cocci) A spherical organism. 



Colony The individual group growing upon laboratory 

 foodstuffs, and usually referring to one small group. The 

 word is used for the growths upon flat dishes that are sup- 

 posed to arise from a single organism. 



Commensal Living in harmless union either indepen- 

 dently or for mutual benefit. 



Complement A constituent of all sera which helps in the 

 union of antibodies and bacteria. 



Cultivation A word used to embrace all the procedures 

 employed to make germs grow under the laboratory con- 

 ditions. 



Culture The mass of bacteria grown artificially upon 

 laboratory foodstuffs. The general term applied to the way 

 bacteria grow. See colony. Adj., cultural. 



