charlock

Meanings

1. 1
   noun

   a yellow-flowered Eurasian wild mustard that commonly grows as a weed in grain fields

   One species of charlock can crowd out a closely related mustard in a cultivated field.

From Middle English charlok and cherlok, from Old English cerlic or a related form; the deeper origin is uncertain. The name has long denoted the yellow-flowered wild mustard now classified as Rhamphospermum arvense (formerly Sinapis arvensis), a familiar weed of cereal crops.

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