n. 1 (also sweet rocket) any of various fast-growing plants, esp. of the genus Hesperis or Sisymbrium. 2 a cruciferous annual plant, Eruca sativa, grown for salad. wall-rocket a yellow-flowered weed, Diplotaxis muralis, emitting a foul smell when crushed. yellow rocket winter cress.
[ F roquette f. It. rochetta, ruchetta dimin. of ruca f. L eruca downy-stemmed plant ]