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blackhead

[blak-hed] /ˈblækˌhɛd/
noun
1.
a small, black-tipped, fatty mass in a skin follicle, especially of the face; comedo.
2.
any of several birds having a black, head, as the greater scaup, Aythya marila.
3.
Also called enterohepatitis. Veterinary Pathology. a malignant, infectious disease of turkeys, chickens, and many wild birds, caused by a protozoan parasite, Histomonas meleagridas, attacking especially the intestines and liver, and often characterized by a darkening of the skin on the head.
Origin
1650-1660
1650-60; black + head
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for blackhead

blackhead

/ˈblækˌhɛd/
noun
1.
a black-tipped plug of fatty matter clogging a pore of the skin, esp the duct of a sebaceous gland Technical name comedo
2.
an infectious and often fatal disease of turkeys and some other fowl caused by the parasitic protozoa Histomonas meleagridis Technical name infectious enterohepatitis
3.
any of various birds, esp gulls or ducks, with black plumage on the head
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for blackhead
n.

"comedo," 1837, from black (adj.) + head (n.). So called for its appearance.

Online Etymology Dictionary, © 2010 Douglas Harper
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blackhead in Medicine

blackhead black·head (blāk'hěd')
n.
A plug of keratin and sebum within a hair follicle that is blackened at the surface. Also called open comedo.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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21
23
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