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Webster's English Dictionary

buoy

n. [D. boei buoy, fetter, fr. OF. boie, buie, chain, fetter, F. boue a buoy, from L. boia. Boiae genus vinculorum tam ferreae quam ligneae. Festus. So called because chained to its place.] (Naut.) A float; esp. a floating object moored to the bottom, to mark a channel or to point out the position of something beneath the water, as an anchor, shoal, rock, etc. ()

Anchor buoy, a buoy attached to, or marking the position of, an anchor. -- Bell buoy, a large buoy on which a bell is mounted, to be rung by the motion of the waves. -- Breeches buoy. See under Breeches. -- Cable buoy, an empty cask employed to buoy up the cable in rocky anchorage. -- Can buoy, a hollow buoy made of sheet or boiler iron, usually conical or pear-shaped. -- Life buoy, a float intended to support persons who have fallen into the water, until a boat can be dispatched to save them. -- Nut buoy or Nun buoy, a buoy large in the middle, and tapering nearly to a point at each end. -- To stream the buoy, to let the anchor buoy fall by the ship's side into the water, before letting go the anchor. -- Whistling buoy, a buoy fitted with a whistle that is blown by the action of the waves. ()

v. t. 1. To keep from sinking in a fluid, as in water or air; to keep afloat; -- with up. ()

2. To support or sustain; to preserve from sinking into ruin or despondency. ()

Those old prejudices, which buoy up the ponderous mass of his nobility, wealth, and title. (Burke.)

3. To fix buoys to; to mark by a buoy or by buoys; as, to buoy an anchor; to buoy or buoy off a channel. ()

Not one rock near the surface was discovered which was not buoyed by this floating weed. (Darwin.)

v. i. To float; to rise like a buoy. (Pope.)