n 1 cap : a genus of filamentous or rod-shaped gram-positive bacteria of the family Actinomycetaceae that includes usu. commensal and sometimes pathogenic forms inhabiting mucosal surfaces esp. of the oral cavity - compare ACTINOMYCOSIS 2 pl actinomyces : a bacterium of the genus Actinomyces ac*ti*no*my*ce*tal adj
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