BARLEYCORN

barleycorn. Barleycorn, n. a grain of barley, the third part of an inch

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Bar″ley‐corn′ (�), n. [[See Corn.]] 1. 1. A grain or “corn” of barley.
2. 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.