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Medical Dictionary

blackhead

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noun black·head \ˈblak-ˌhed\

Medical Definition of blackhead

  1. 1:  a small plug of sebum blocking the duct of a sebaceous gland especially on the face—compare milium

  2. 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




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