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a small, black-tipped, fatty mass in a skin follicle, especially of the face; comedo.
any of several birds having a head that is black, as the greater scaup, Aythya marila.
Also called enterohepatitis. Veterinary Pathology. a malignant, infectious disease of turkeys, chickens, and many wild birds, caused by a protozoan parasite, Histomonas meleagridas, attacking especially the intestines and liver, and often characterized by a darkening of the skin on the head.
Historical Examples

The History of England from the Accession of James II. Thomas Babington Macaulay
The Romance of War Inventions Thomas W. Corbin
Slave Narratives: a Folk History of Slavery in the United States From Interviews with Former Slaves Work Projects Administration
The Dollar Hen Milo M. Hastings
The History of England from the Accession of James II. Thomas Babington Macaulay
The History of England from the Accession of James II. Thomas Babington Macaulay

a black-tipped plug of fatty matter clogging a pore of the skin, esp the duct of a sebaceous gland Technical name comedo
an infectious and often fatal disease of turkeys and some other fowl caused by the parasitic protozoa Histomonas meleagridis Technical name infectious enterohepatitis
any of various birds, esp gulls or ducks, with black plumage on the head


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