Source : Webster's Revised Unabridged Dictionary (1913)

Sharpshooter \Sharp"shoot`er\, n.
   One skilled in shooting at an object with exactness; a good
   marksman.

Source : WordNet®

sharpshooter
     n 1: an athlete noted for accurate aim
     2: someone skilled in shooting [syn: {marksman}, {crack shot}]
     3: a fast schooner once used by New England fisherman for
        illegal fishing in Canadian waters