Nut n.
 1. Bot. The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.), consisting of a hard and indehiscent shell inclosing a kernel.
 2. A perforated block (usually a small piece of metal), provided with an internal or female screw thread, used on a bolt, or screw, for tightening or holding something, or for transmitting motion. See Illust. of 1st Bolt.
 3. The tumbler of a gunlock.
 4. Naut. A projection on each side of the shank of an anchor, to secure the stock in place.
 Check nut, Jam nut, Lock nut, a nut which is screwed up tightly against another nut on the same bolt or screw, in order to prevent accidental unscrewing of the first nut.
 Nut buoy. See under Buoy.
 Nut coal, screened coal of a size smaller than stove coal and larger than pea coal; -- called also chestnut coal.
 Nut crab Zool., any leucosoid crab of the genus Ebalia as, Ebalia tuberosa of Europe.
 Nut grass Bot., See nut grass in the vocabulary.
 Nut lock, a device, as a metal plate bent up at the corners, to prevent a nut from becoming unscrewed, as by jarring.
 Nut pine. Bot. See under Pine.
 Nut rush Bot., a genus of cyperaceous plants (Scleria) having a hard bony achene.  Several species are found in the United States and many more in tropical regions.
 Nut tree, a tree that bears nuts.
 Nut weevil Zool., any species of weevils of the genus Balaninus and other allied genera, which in the larval state live in nuts.


 Buoy n.  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.