Medical Definition of micrococcus
1 capitalized : a large genus (the type genus of the family Micrococcaceae) of nonmotile gram-positive spherical bacteria that occur in tetrads or irregular clusters and include nonpathogenic forms (as M. luteus) that are typically harmless saprophytes on human skin but may cause opportunistic skin infections in immunocompromised individuals
2plural micrococci \-ˈkäk-ˌ(s)ī\play : a small spherical bacterium; especially : any bacterium of the genus Micrococcus
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