One of the mysteries of the English language finally explained.
A genus of fungi including yeasts that form pellicles or skins on the surfaces of certain liquids, and that are involved in the fermentation of alcoholic liquids into vinegar, and formerly including other pellicle-forming organisms (especially mother of vinegar), organisms causing certain diseases of the skin or mucous membranes, and organisms believed to be responsible for nitrogen fixation in soil; (also mycoderma) a fungus of this genus.
Mid 19th century; earliest use found in John Lindley (1799–1865), botanist and horticulturist. From scientific Latin Mycoderma from myco- + post-classical Latin derma skin.
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