The Collaborative International Dictionary of English v.0.48:
gunsight \gun"sight`\ (g[u^]n"s[imac]t`), n. A sight[9] attached to a gun, used for aiming it at the target. Same as sight[9]. [WordNet 1.5]WordNet (r) 3.0 (2006):
gunsight n 1: a sight used for aiming a gun [syn: gunsight, gun- sight]