The DICT Development Group

  Rocket \Rock"et\, n. [F. roquette (cf. Sp. ruqueta, It
     ruchetta), fr. L. eruca.] (Bot.)
     (a) A cruciferous plant ({Eruca sativa) sometimes eaten in
         Europe as a salad.
     (b) Damewort.
     (c) Rocket larkspur. See below.
         [1913 Webster]
  
     Dyer's Rocket. (Bot.) See Dyer's broom, under Broom.
  
     Rocket larkspur (Bot.), an annual plant with showy flowers
        in long racemes ({Delphinium Ajacis).
  
     Sea rocket (Bot.), either of two fleshy cruciferous plants
        ({Cakile maritima and Cakile Americana) found on the
        seashore of Europe and America.
  
     Yellow rocket (Bot.), a common cruciferous weed with yellow
        flowers ({Barbarea vulgaris).
        [1913 Webster]

  Delphinium ajacis
      n 1: commonly cultivated larkspur of southern Europe having
           unbranched spikelike racemes of blue or sometimes purplish
           or pinkish flowers; sometime placed in genus Delphinium
           [syn: rocket larkspur, Consolida ambigua, Delphinium
           ajacis]