Crest  —n. 1 a comb or tuft etc. On a bird's or animal's head. B plume etc. On a helmet etc. 2 top of a mountain, wave, roof, etc. 3 heraldry a device above a coat of arms. B such a device on writing-paper etc. —v. 1 reach the crest of. 2 provide with a crest or serve as a crest to. 3 (of a wave) form a crest.  crested adj. [latin crista]