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blackhead
noun
- any of various black-headed birds, esp. the scaup duck
- a black-tipped plug of dried fatty matter in a pore of the skin
- ☆ an infectious disease of the intestines and liver of turkeys, chickens, etc. caused by a protozoan (Histomonas meleagridis) and characterized by a dark, discolored comb
- the parasitic larva of a freshwater mussel (family Unionidae) encysted in the gills, etc. of a fish
See blackhead in American Heritage Dictionary 4
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