Main Entry:

black·head

Pronunciation:

\ˈblak-ˌhed\

Function:

noun

Date:

circa 1837

1 : a small plug of sebum blocking the duct of a sebaceous gland especially on the face 2 : 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