blackhead
noun
black·head
ˈblak-ˌhed
1
: a small plug of darkened sebum and dead skin cells that fills a pore of the skin especially on the face
called also comedo, open comedo
compare whitehead2
: a destructive disease of turkeys and related birds caused by a protozoan (Histomonas meleagridis) that invades the intestinal ceca and liver
3
: a larval clam or mussel attached to the skin or gills of a freshwater fish
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Merriam-Webster unabridged
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