noun

• (carpentry) A projection or tenon at the end of a beam designed to fit into a matching opening of another piece of wood to form a joint.
• (mining) One of the rough pillars of stone or coal left to support the roof of a mine.

verb

• (intransitive) Of an electric motor or generator, to snap preferentially to certain positions when not energized.

noun

• (historical) A partially clinker-built, flat-bottomed, square-rigged mediaeval ship of burden or war, with a round, bulky hull and a single mast, typically 15 to 25 meters in length, in use from ca. 1150 to 1500.
  "The name of the ship was Dawn Treader. She was only a little bit of a thing compared with one of our ships, or even with the cogs, dromonds, carracks and galleons which Narnia had owned when Lucy and Edmund had reigned there under Peter as the High King, for nearly all navigation had died out in the reigns of Caspian's ancestors."
• (historical) The hypothetical precursor ship type of the above said to be in use during the early Middle Ages, variously alleged to be Frisian or Scandinavian.
• (by extension) A small fishing boat.

noun

• (nautical) Abbreviation of course over ground.