Char-lock

charlock

[chahr-luhk]
noun
a wild mustard, Brassica kaber, having lobed, ovate leaves and clusters of small, yellow flowers, often troublesome as a weed in grainfields.

Origin:
before 1000; Middle English cherlok, Old English cerlic < ?

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charlock (ˈtʃɑːlɒk)
 
n
1.  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.  white charlock, wild radish, Also called runch a related plant, Raphanus raphanistrum, with yellow, mauve, or white flowers and podlike fruits
 
[Old English cerlic, of obscure origin]

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