charlock

noun
char·​lock | \ˈchär-ˌläk, -lək\

Definition of charlock 

: an Old World mustard (Brassica kaber synonym Sinapis arvensis) that is a common weed in grain fields

called also wild mustard

First Known Use of charlock

before the 12th century, in the meaning defined above

History and Etymology for charlock

Middle English cherlok, from Old English cerlic

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The first known use of charlock was before the 12th century

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Britannica.com: Encyclopedia article about charlock

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