blackhead

(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

See blackhead in American Heritage Dictionary 4

noun
  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.

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