ˌrīˌzäkˈtōnēə noun
Etymology: New Latin, from rhiz- + Greek ktonos murder + New Latin -ia — more at -ctonus
1. capitalized : a form genus of imperfect fungi (order Mycelia Sterilia) that formerly included numerous fungi which since the discovery of their perfect stages have been placed in other genera (as Corticium and Pellicularia )
2. -s : any fungus now or formerly belonging to the form genus Rhizoctonia