black head's

blackhead

[blak-hed]
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:
1650–60; black + head

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Collins
World English Dictionary
blackhead (ˈblækˌhɛd)
 
n
1.  Technical name: comedo a black-tipped plug of fatty matter clogging a pore of the skin, esp the duct of a sebaceous gland
2.  Technical name: infectious enterohepatitis an infectious and often fatal disease of turkeys and some other fowl caused by the parasitic protozoa Histomonas meleagridis
3.  any of various birds, esp gulls or ducks, with black plumage on the head

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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