bilge board

bilge board

[′bilj ‚bȯrd]
(naval architecture)
A wood or metal board that slides in a case like a centerboard, but is built into each bilge of a ship.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Taff put his allotted bilge boards across a pair of thwarts and rolled out his bed roll.