ROWEL

noun

1. The small spiked wheel on the end of a spur.
2. A little flat ring or wheel on a horse's bit.
3. A roll of hair, silk, etc., passed through the flesh of a horse in the manner of a seton in human surgery.

verb

1. To use a rowel on (something), especially to drain fluid.
2. To fit with spurs.
3. To apply the spur to.