blackhead

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English[edit]

Etymology[edit]

black + head

Noun[edit]

blackhead (countable and uncountable, plural blackheads)

  1. (countable, medicine) A comedo, a skin blemish, a type of acne vulgaris, where a pore becomes clogged with a dark, hard, cheesy keratin-filled substance forming a hard black "head" on the skin's surface.
  2. (uncountable) A form of histomoniasis in poultry, characterized by cyanotic discoloration on the bird's head.
  3. (countable) A scaup: a kind of duck.

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