Rowel
Rowel , noun
[Old French roele, rouele, properly, a little wheel, French rouelle collop, slice, Late Latin rotella a little wheel, dim. of Latin rota a wheel. See Roll, and compare Rota.]
1.
The little wheel of a spur, with sharp points.
With sounding whip, and rowels dyed in blood.
2.
A little flat ring or wheel on horses' bits.
The iron rowels into frothy foam he bit.
3.
(Farriery) A roll of hair, silk, etc., passed through the flesh of horses, answering to a seton in human surgery.
Rowel , transitive verb
(Farriery) To insert a rowel, or roll of hair or silk, into (as the flesh of a horse). — Mortimer