gunsight

from WordNet (r) 3.0 (2006)

gunsight
    n 1: a sight used for aiming a gun [syn: {gunsight}, {gun-
         sight}]

from 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]