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Related to charlock: wild radish
An annual weed (Sinapis arvensis) in the mustard family, native to Eurasia and naturalized in North America, having racemes of yellow flowers and hairy stems and foliage. Also called wild mustard.
[Middle English cherlok, from Old English cerlic.]
1. (Plants) Also called: wild mustard a weedy Eurasian plant, Sinapis arvensis (or Brassica kaber), with hairy stems and foliage and yellow flowers: family: Brassicaceae (crucifers)
2. (Plants) white charlock Also called: wild radish or runch a related plant, Raphanus raphanistrum, with yellow, mauve, or white flowers and podlike fruits
[Old English cerlic, of obscure origin]
char•lock(ˈtʃɑr lək, -lɒk)
a wild mustard, Brassica kaber, having lobed, ovate leaves and clusters of small yellow flowers: a weed in grain fields.
[before 1000; Middle English cherlok, Old English cerlic]