• Webster's Revised Unabridged Dictionary
    • n Leeboard lē"bōrd` A board, or frame of planks, lowered over the side of a vessel to lessen her leeway when closehauled, by giving her greater draught.
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Century Dictionary and Cyclopedia
    • n leeboard One of two long flat pieces of wood attached one on each side of a flat-bottomed vessel (as a Dutch galiot) by a bolt on which it traverses. When the vessel is closehauled the board on the lee side is let down, reaching below the keel, and when the ship is listed over by the wind it resists the tendency to drift too fast to leeward.
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In literature:

The value of the leeboards now became apparent.
"The Giant of the North" by R.M. Ballantyne
The leeboard is a necessary attachment to the sailing outfit.
"Boy Scouts Handbook" by Boy Scouts of America
They've put down leeboards; an' with leeboards down a Micmac canoe's hard to beat.
"The Forge in the Forest" by Charles G. D. Roberts