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- n. Plural form of leeboard.
Sorry, no etymologies found.
They were shallow boats without a deep keel, often rigged with leeboards, and were at risk of capsizing in a sudden squall.
Their course for the first two miles was dead to windward; but the raft sailed remarkably near the wind, and held her own even better than her designer had believed to be possible -- the long, flat sides of the two pontoons seeming to act the parts of leeboards, and so preventing her from making any perceptible leeway.
It is clear, that if both the guaras be thrust quite down, and held fast in a perpendicular direction, they will offer a broad surface towards the side, and thus, by acting like the leeboards of a river-barge, or the keel of a ship, prevent the balsa from drifting sidewise or dead to leeward.
_leeboards_, such as are used even at the present day by Dutch ships.