Definitions from Wiktionary (blackhead)

▸ noun:  (countable, medicine) A type of 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.
▸ noun:  (uncountable) A form of histomoniasis in poultry, characterized by cyanotic discoloration on the bird's head.
▸ noun:  (countable) A scaup: any of various ducks of the genus Aythya.
▸ Also see blackhead

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