\Mi`cro*coc"cus\, n.; pl. {Micrococci}. [NL. See
{Micro-}, and {Coccus}.] (Biol.)
A genus of {Spherobacteria}, in the form of very small
globular or oval cells, forming, by transverse division,
filaments, or chains of cells, or in some cases single
organisms shaped like dumb-bells ({Diplococcus}), all without
the power of motion. See Illust. of {Ascoccus}.
Note: Physiologically, micrococci are divided into three
      groups; chromogenic, characterized by their power of
      forming pigment; zymogenic, including those associated
      with definite chemical processes; and pathogenic, those
      connected with disease.