rowel

ROW'EL, n. [L. rota.]

1. The little wheel of a spur, formed with sharp points.

2. Among farriers, a roll of hair or silk, used as an issue on horses, answering to a seton in surgery.

3. A little flat ring or wheel of plate or iron on horses' bits.

ROW'EL, v.t To insert a rowel in; to pierce the skin and keep open the wound by a rowel.