Actinomycete Definition

Any of various bacteria (order Actinomycetales) with a branching, filamentous structure; esp., any of a family (Actinomycetaceae) of Gram-positive bacteria that are pathogenic to humans and animals.

Any of various spore-forming, chiefly filamentous bacteria of the order Actinomycetales that are abundant in soil. Some species produce natural antibiotics, and some are human pathogens.