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Barleycorn \Bar"ley*corn`\, n. [See {Corn}.] 1. A grain or ``corn'' of barley. 2. Formerly, a measure of length, equal to the average length of a grain of barley; the third part of an inch. {John Barleycorn}, a humorous personification of barley as the source of malt liquor or whisky.
barleycorn n 1: a grain of barley 2: a grain of barley [syn: {barley}]