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]