A deadeye and rope lanyard on a sailing ship.
- a round, flat block of wood with three holes in it for a lanyard, used in pairs on a sailing ship to hold the shrouds and stays taut
- Slang an accurate marksman
- Nautical A flat hardwood disk with a grooved perimeter, pierced by three holes through which the lanyards are passed, used to fasten the shrouds.
- Slang An expert shooter: a deadeye with the rifle.