-ˌmīsəˈtā(ˌ)lēz noun plural
Usage: capitalized
Etymology: New Latin, from Actinomycet-, Actinomyces + -ales
: an order of filamentous or rod-shaped bacteria tending strongly to the development of branches and true mycelium and lacking photosynthetic pigment — see mycobacteriaceae , streptomycetaceae