blackhead

black·head

noun \ˈblak-ˌhed\

Definition of BLACKHEAD

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