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  • noun
    A plug of sebum in a hair follicle, darkened by oxidation. (These pimples vary according to the severity of the acne and range from whiteheads, blackheads, pustules and nodules to cysts.)
    An infectious disease of turkeys producing discoloration of the head, caused by a protozoan. (Turkey farmers in the UK are in a panic over blackhead disease, fearing an outbreak among their flocks after the drug they used to rely on was banned.)


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