(plural megacocci) [ < mega-comb. form + -coccus (in micrococcusn., probably after German Megacoccos (1874)] Biologyrare a (relatively) large coccoid bacterium; cf. macrococcusn. at macro-comb. form 1a, micrococcusn.
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1883 D. MacAlister tr. E. Ziegler Text-bk. Pathol. Anat.i. §185. 265 According to size we may distinguish them as micrococci, mesococci, and megacocci.