n. [ Ar. & Per. rokh or rukh. Cf. Rook a castle. ] A monstrous bird of Arabian mythology.
‖n. [ F. Cf. Rock a stone. ] (Art)
n. [ F. ]
a. [ F. roccellique, fr. roccelle archil, It. & NL. roccella, fr. It. rocca a rock, because archil grows on rock. ] (Chem.) Pertaining to, or designating, a dibasic acid of the oxalic series found in archil (Roccella tinctoria, etc.), and other lichens, and extracted as a white crystalline substance
n. A red dyestuff, used as a substitute for cochineal, archil, etc. It consists of the sodium salt of a complex azo derivative of naphtol. [ 1913 Webster ]
n. [ See Rock. ] Rock. [ Obs. ] Chaucer. [ 1913 Webster ]
(Chem.) A kind of alum occuring in small fragments; -- so called from Rocca, in Syria, whence alum is said to have been obtained; -- also called
n. [ F. roche rock + E. lime. ] Lime in the lump after it is burned; quicklime. [ Eng. ] [ 1913 Webster ]
n. A seaport town in France. [ 1913 Webster ]
Rochelle powders.
Rochelle salt (Chem.),
‖ [ F., sheep-shaped rock. ] (Geol.) See Sheepback. [ 1913 Webster ]