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blackhead definition

black·head (blakhed′)

noun

  1. any of various black-headed birds, esp. the scaup duck
  2. a black-tipped plug of dried fatty matter in a pore of the skin
  3. ☆ an infectious disease of the intestines and liver of turkeys, chickens, etc. caused by a protozoan (Histomonas meleagridis) and characterized by a dark, discolored comb
  4. the parasitic larva of a freshwater mussel (family Unionidae) encysted in the gills, etc. of a fish

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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