'Jam nut' definitions:

Definition of 'Jam nut'

From: GCIDE
  • Nut \Nut\ (n[u^]t), n. [OE. nute, note, AS. hnutu; akin to D. noot, G. nuss, OHG. nuz, Icel. hnot, Sw. n["o]t, Dan. n["o]d.] [1913 Webster]
  • 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. [1913 Webster]
  • 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. [1913 Webster]
  • 3. The tumbler of a gunlock. --Knight. [1913 Webster]
  • 4. (Naut.) A projection on each side of the shank of an anchor, to secure the stock in place. [1913 Webster]
  • 5. pl. Testicles. [vulgar slang] [PJC]
  • 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. [1913 Webster]

Definition of 'Jam nut'

From: GCIDE
  • Jam \Jam\, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called jelly; as, raspberry jam; currant jam; grape jam. [1913 Webster]
  • Jam nut. See Check nut, under Check.
  • Jam weld (Forging), a butt weld. See under Butt. [1913 Webster]