rutter

noun5

1. •
   (historical) A set of instructions for navigating a course at sea; a pilot's book or seaman's guide.

   • But a rutter was only as good as the pilot who wrote it, the scribe who hand-copied it, the very rare printer who printed it, or the scholar who translated it. — 1975
2. •
   (historical) A horseman or cavalryman, especially a German one, associated with the wars of the 16th and 17th centuries.

   • Such a regiment of rutters / Never defied men braver — 1611
3. •
   (Scotland) A tool used in peat cutting or for marking off ground.
4. •
   (US, Canada) A type of plough used by lumberjacks to carve a track for a sleigh.
5. •
   (slang) The penis.

   • She moved my rutter so that it was not poking into her. We fell asleep. — 2013