1.  deadeye(n = noun.person) - a dead shot;
is a kind of crack shot, marksman, sharpshooter

2.  deadeye(n = noun.artifact) - (nautical) a round hardwood disk with holes and a grooved perimeter used to tighten a shroud;
is a kind of disc, disk

deadeye, n.
1 Naut. a circular wooden block with a groove round the circumference to take a lanyard, used singly or in pairs to tighten a shroud.
2 US colloq. an expert marksman.