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A piece of fabric attached to a boat and arranged such that it causes the wind to drive the boat along. The sail may be attached to the boat via a combination of mast, spars and ropes.
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(nautical,uncountable) The concept of a sail or sails, as if a substance.
example
Take in sail: a storm is coming.
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The power harnessed by a sail or sails, or the use of this power for travel or transport.
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A trip in a boat, especially a sailboat.
example
Let's go for a sail.
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(plural "sail") A sailing vessel; a vessel of any kind; a craft.
example
Twenty sail were in sight.
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The blade of a windmill.
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A tower-like structure found on the dorsal (topside) surface of submarines.
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The floating organ of siphonophores, such as the Portuguese man-of-war.
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A sailfish.
example
We caught three sails today.
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An outward projection of the spine, occurring in certain dinosaurs and synapsids
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Anything resembling a sail, such as a wing.