What is "chardlock"

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.

Jointed charlock, White charlock, a troublesome weed ( Raphanus Raphanistrum) with straw-colored, whitish, or purplish flowers, and jointed pods: wild radish.