barleycorn

noun
bar·​ley·​corn | \ˈbär-lē-ˌkȯrn \

Definition of barleycorn 

1 : a grain of barley

2 : an old unit of length equal to a third of an inch

First Known Use of barleycorn

1500, in the meaning defined at sense 2

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The first known use of barleycorn was in 1500

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