blackhead definition

  • noun:
    • 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.
    • a standard name for comedo. See comedo.
    • a black-tipped plug blocking a pore of the skin

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