| 单词 | blackhead |
| 释义 | blackhead /blak"hed'/, n. 1. a small, black-tipped, fatty mass in a skin follicle, esp. of the face; comedo. 2. any of several birds having a black head, as the greater scaup, Aythya marila. 3. Also called enterohepatitis. Vet. Pathol. a malignant, infectious disease of turkeys, chickens, and many wild birds, caused by a protozoan parasite, Histomonas meleagridas, attacking esp. the intestines and liver, and often characterized by a darkening of the skin on the head. [1650-60; BLACK + HEAD] |
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