Dictionary![]() ![]() mast' clamp"Naut. 1. a pierced slab of hardwood built into the deck structure of a small ship or boat to receive the force of the mast, which is fitted tightly through it. 2. Also called mast hasp. a metal collar fitted to a thwart of a small boat to steady a mast. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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