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blackhead

American  
[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 head that is black, 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.

blackhead British  
/ ˈblækˌhɛd /

noun

  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" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of blackhead

First recorded in 1650–60; black + head

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.