n 1  cap  :  a genus of spherical or ovoid chiefly nonmotile and parasitic gram-positive bacteria (family Streptococcaceae) that divide only in one plane, occur in pairs or chains, and include important pathogens of humans and domestic animals  2  pl  -coc*ci   :  any bacterium of the genus Streptococcus : broadly  :  a coccus occurring in chains .
 
 
 
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