rowels

/R AW1 AH0 L Z/
noun
  1. 1

    The small spiked wheel on the end of a spur.

  2. 2

    A little flat ring or wheel on a horse's bit.

  3. 3

    A roll of hair, silk, etc., passed through the flesh of a horse in the manner of a seton in human surgery.

Source: https://en.wiktionary.org/wiki/rowel, https://en.wiktionary.org/wiki/rowels