Dead-eye n. Naut. A round, flattish, wooden block, encircled by a rope, or an iron band, and pierced with three holes to receive the lanyard; -- used to extend the shrouds and stays, and for other purposes. Called also deadman's eye.
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deadeye
n 1: a dead shot
2: (nautical) a round hardwood disk with holes and a grooved
perimeter used to tighten a shroud