knotter

noun5

1. •
   A person who makes knots.

   • This was Jai, the expert lace-knotter […] — 1961
2. •
   A machine or device that makes knots.
3. •
   [in compounds] A vessel capable of reaching a specified speed in knots.

   • Their engines being “simple,” they consumed a perfectly ruinous amount of coal, sixty-four tons for the round trip; considerably more than the coal consumption of the present twenty-four knotters. — 1920
4. •
   [in compounds] A wind blowing at a specified velocity in knots.

   • “See how the canvass unfurls itself like great white wings, and spreads its volumes upon the air. The wind is a strong eight-knotter, and will give her a firm headway for Tom’s purpose.” — 1847
5. •
   A screen used to remove “knots” or impurities from wood pulp in the process of making paper.

   • Following cooking, the cooked mixture is vented to a blow tank and from here pumped to a knotter for the removal of knots. — 1963