n 1  cap  :  a genus of saprophytic rod-shaped or spindle-shaped usu. gram-positive bacteria of the family Bacillaceae that are anaerobic or require very little free oxygen and are nearly cosmopolitan in soil, water, sewage, and animal and human intestines, that are very active biochemically comprising numerous fermenters of carbohydrates with vigorous production of acid and gas, many nitrogen-fixers, and others which rapidly putrefy proteins, and that include important pathogens - see BLACKLEG BOTULISM GAS GANGRENE TETANUS BACILLUS   2  pl  clos*trid*ia   a  :  any bacterium of the genus Clostridium  b  :  a spindle-shaped or ovoid bacterial cell : esp  :  one swollen at the center by an endospore clos*trid*i*al adj 
 
 
 
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