Rocker arm (Mach.), an arm borne by a rock shaft.
Rock"ered (?), a. (Naut.) Shaped like a rocker; curved; as, a rockered
keel.
Rock"er*y (?), n. (Gardening) A mound formed of fragments of rock,
earth, etc., and set with plants.
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.
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 C. Americana) found on the seashore of Europe and
America. -- Yellow rocket (Bot.), a common cruciferous weed with yellow
flowers (Barbarea vulgaris).
Rock"et (?), n. [It. rocchetta, fr. rocca a distaff, of German origin.
Named from the resemblance in shape to a distaff. See Rock a distaff.]
1. An artificial firework consisting of a cylindrical case of paper or
metal filled with a composition of combustible ingredients, as niter,
charcoal, and sulphur, and fastened to a guiding stick. The rocket is
projected through the air by the force arising from the expansion of
the gases liberated by combustion of the composition. Rockets are used
as projectiles for various purposes, for signals, and also for
pyrotechnic display.