Source : Webster's Revised Unabridged Dictionary (1913)

Coccobacterium \Coc`co*bac*te"ri*um\, n.; pl. {Coccobacteria}.
   [NL., fr. Gr. ? a grain + NL. bacterium. So called from its
   round shape.] (Biol.)
   One of the round variety of bacteria, a vegetable organism,
   generally less than a thousandth of a millimeter in diameter.