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blackhead

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black⋅head

  [blak-hed]
Use blackhead in a Sentence
–noun
1. a small, black-tipped, fatty mass in a skin follicle, esp. 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 esp. the intestines and liver, and often characterized by a darkening of the skin on the head.
Origin:
1650–60; black + head
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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black·head   (blāk'hěd')   
n.  

  1. Medicine A plug of keratin and sebum within a hair follicle that is blackened at the surface. Also called comedo.

  2. 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.

  3. Any of various birds, such as the scaup, with dark head markings.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: black·head
Pronunciation: 'blak-"hed
Function: noun
1 : a small plug of sebum blocking the duct of a sebaceous gland especially onthe face —compare MILIUM
2 : a destructive disease of turkeys and related birds caused by a protozoanof the genus Histomonas (H. meleagridis) that invades the intestinal ceca and liver called also enterohepatitis, histomoniasis, infectious enterohepatitis
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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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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