Definition: A genus of nonmotile, anaerobic, chemoorganotrophic bacteria (family Peptococcaceae) containing gram-positive, spheric cells that occur singly, in pairs, tetrads, or irregular masses, and rarely in short chains. They are frequently found in association with pathologic conditions. The type species is Peptococcus niger.
[G. pepto, to digest, + kokkos, berry]
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Examples: glitazone, GI cocktail, etc.