medication A plug of keratin and sebum within a hair hair follicle which blackened in the surface. Also called comedo.
An infectious infection of turkeys and some wildfowl that is caused by a protozoan (Histomonas meleagridis) and leads to lesions associated with intestine and liver. Also referred to as enterohepatitis, histomoniasis, infectious enterohepatitis.
Any of different wild birds, including the scaup, with dark head markings.
A comedo, a skin blemish, a form of pimples vulgaris, in which a pore becomes clogged with a dark, tough, cheesy keratin-filled substance creating a tough black "head" on skin's surface.
A scaup: some sort of duck.
The scaup duck.
a favorite title associated with the scaups or sea-ducks of genus Aithyia: as, the higher and cheaper blackheads, A. marila and A. affinis. See scaup.
an area name in the usa associated with black-headed minnow, or fathead, Pimphales promelas.
In entomology, the larva of an American tortricid moth, Eudemis vacciniana, which feeds regarding the leaves for the cranberry. Also called fire-worm.