Main Entry: black·head

Pronunciation: \ˈblak-ˌhed\

Function: noun

1 : a small plug of sebum blocking the duct of a sebaceous gland especially on the face—compare milium
2 : a destructive disease of turkeys and related birds caused by a protozoan of the genus Histomonas (H. meleagridis) that invades the intestinal ceca and liver—called also enterohepatitis, histomoniasis, infectious enterohepatitis