ac·tin·o·my·cete 
(ăk-tĭn′ō-mīsēt, ăk′tə-nō-)
(ăk-tĭn′ō-mīsēt, ăk′tə-nō-)n.
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.