leeboard

[ lee-bawrd, -bohrd ]
/ ˈliˌbɔrd, -ˌboʊrd /

noun Nautical.

either of two broad, flat objects attached to the sides of a sailing ship amidships, the one on the lee side being lowered into the water to prevent the ship from making leeway.

Origin of leeboard

1400–50; late Middle English: the lee side of a ship; see lee1, board
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for leeboard

leeboard

/ (ˈliːˌbɔːd) /

noun

nautical one of a pair of large adjustable paddle-like boards that may be lowered along the lee side to reduce sideways drift or leeway
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012