
1) Chinese invention 2) Movable plank on a hull 3) Sailboat appurtenance
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https://www.crosswordclues.com/clue/leeboard

A fin mounted on the side of a boat (usually in pairs) that can be lowered on the lee side of the ship to reduce leeway (similarly to a centerboard, which see).
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http://en.wikipedia.org/wiki/Glossary_of_nautical_terms

A fin mounted on the side of a boat (usually in pairs) that can be lowered on the lee side of the ship to reduce leeway (similarly to a centerboard, which see).
Found on
http://en.wikipedia.org/wiki/Glossary_of_nautical_terms

A leeboard is a lifting foil used by a sailboat, much like a centerboard, but located on the leeward side of the boat. The leeward side is used so that the leeboard is not lifted from the water when the boat heels, or leans under the force of the wind. ==History== Leeboards existed in China from at least the eighth century on warships that `held ....
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http://en.wikipedia.org/wiki/Leeboard

wood or metal planes attached to hull to prevent leeway
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http://phrontistery.info/l.html

wood or metal planes attached to hull to prevent leeway
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http://phrontistery.info/nautical.html

• (n.) 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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http://thinkexist.com/dictionary/meaning/leeboard/

Boards hung from the side of a boat to reduce leeway. Or a board placed vertically along the side of a bunk to keep the occupant from falling out.
Found on
http://www.diy-wood-boat.com/Boating-terms.html
Lee'board` (lē'bōrd`)
noun A board, or frame of planks, lowered over the side of a vessel to lessen her leeway when closehauled, by giving her greater draught.
Found on
http://www.encyclo.co.uk/webster/L/25
No exact match found.