Etymology
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coccus (n.)

1763 as an insect genus (including the cochineal bug and the kermes); 1883 as a type of bacterium; from Greek kokkos "grain, seed, berry" (see cocco-). Related: Coccoid.

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Definitions of coccus

coccus (n.)
any spherical or nearly spherical bacteria;
Synonyms: cocci
From wordnet.princeton.edu