1. Nautical A flat hardwood disk with a grooved perimeter, pierced by three holes through which the lanyards are passed, used to fasten the shrouds.
2. Slang An expert shooter: a deadeye with the rifle.
(click for a larger image)deadeye
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.