blackhead

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English[edit]

Etymology[edit]

From black +‎ head.

Noun[edit]

blackhead (plural blackheads)

  1. (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. A form of histomoniasis in poultry, characterized by cyanotic discoloration on the bird's head.
  3. A scaup: a kind of duck.

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