The Encyclopedia Americana (1920)/Blackhead

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The Encyclopedia Americana
Blackhead
Edition of 1920. See also blackhead on Wiktionary, and the disclaimer.

BLACKHEAD, the name for several animals, characterized by the blackness of the head; especially in the United States: (1) the scaup duck; (2) a common minnow, the fathead. The name is also applied to the accumulations of dirt found in the sebaceous follicles.