n 1  cap  :  a genus of bacteria (family Peptococcaceae) that are gram-positive cocci, are mostly harmless saprophytes but include a few serious brewery pests, and have cells which under favorable conditions divide in three directions into cubical masses  2  pl  -nas  or  -nae   :  any bacterium of the genus Sarcina .
 
 
 
Similar sounding terms:  cer·e·sin 
 
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