from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Medicine A plug of keratin and sebum within a hair follicle that is blackened at the surface. Also called comedo.
- n. An infectious disease of turkeys and some wildfowl that is caused by a protozoan (Histomonas meleagridis) and results in lesions of the intestine and liver. Also called enterohepatitis, histomoniasis, infectious enterohepatitis.
- n. Any of various birds, such as the scaup, with dark head markings.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A comedo, a skin blemish, a type of acne vulgaris, where a pore becomes clogged with a dark, hard, cheesy keratin-filled substance forming a hard black "head" on the skin's surface.
- n. A scaup: a kind of duck.
from the GNU version of the Collaborative International Dictionary of English
- n. The scaup duck.
from The Century Dictionary and Cyclopedia
- n. A popular name of the scaups or sea-ducks of the genus Aithyia: as, the greater and lesser blackheads, A. marila and A. affinis. See scaup.
- n. A local name in the United States of the black-headed minnow, or fathead, Pimphales promelas.
- n. In entomology, the larva of an American tortricid moth, Eudemis vacciniana, which feeds on the leaves of the cranberry. Also called fire-worm.
- n. A common name for comedo. See comedo.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a black-tipped plug clogging a pore of the skin
From black + head. (Wiktionary)