Noun
A grain or "corn" of barley.
Formerly, a measure of length, equal to the average length of a grain of barley; the third part of an inch.
Source: Webster's dictionaryJohn Barleycorn got up again, And sore surprised them all. Robert Burns
By the time Norris held a mock funeral parade to "bury John Barleycorn " in 1919, the Acre had become a part of Fort Worth history. Source: Internet
If all goes well, you’ll be able to come by the 30-seat cafe this Thursday—it’s opening in the former John Barleycorn space. Source: Internet