Source : Webster's Revised Unabridged Dictionary (1913)

Coccus \Coc"cus\, n.; pl. {Cocci}. [NL., fr. Gr. ? grain, seed.
   See {Cochineal}.]
   1. (Bot.) One of the separable carpels of a dry fruit.

   2. (Zo["o]l.) A genus of hemipterous insects, including scale
      insects, and the cochineal insect ({Coccus cacti}).

   3. (Biol.) A form of bacteria, shaped like a globule.

Source : WordNet®

coccus
     n : any spherical or nearly spherical bacteria [syn: {cocci}]
     [also: {cocci} (pl)]