Emily Dickinson Lexicon

ROW'EL, n. [Old Fr. rouelle; G. rädel; Sp. rodaja, a small wheel, a rowel; rueda, a wheel, L. rota, W. rhod. The French rouelle is a diminutive of roue, contracted from rota.]

1. The little wheel of a spur, formed with sharp points.
2. Among farriers, a roll of hair or silk, passed through the flesh on horses, answering to a seton in surgery. Encyc.
3. A little flat ring or wheel of plate or iron on horses' bits. Spenser.