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From The Collaborative International Dictionary of English v.0.48:
Charlock \Char"lock\, n. [AS. cerlic; the latter part perh. fr. AS. le['a]c leek. Cf. Hemlock.] (Bot.) A cruciferous plant (Brassica sinapistrum) with yellow flowers; wild mustard. It is troublesome in grain fields. Called also chardock, chardlock, chedlock, and kedlock. [1913 Webster] Jointed charlock, White charlock, a troublesome weed (Raphanus Raphanistrum) with straw-colored, whitish, or purplish flowers, and jointed pods: wild radish. [1913 Webster]