kēˈtōmēəm noun
Usage: capitalized
Etymology: New Latin, from Greek chaitōma plume (from chaitē hair) + New Latin -ium — more at chaeta
: a genus (the type of the family Chaetomiaceae) of ascomycetous fungi that are characterized by long straight, curled, or branched hairs on the usually dull-colored perithecia especially on their upper surfaces and that include several fungi destructive to paper and other materials and to some plastics