Etymology
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blackhead (n.)

"comedo," 1837, from black (adj.) + head (n.). So called for its appearance.

updated on October 26, 2012

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Definitions of blackhead from WordNet

blackhead (n.)
a black-tipped plug clogging a pore of the skin;
Synonyms: comedo
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.