Source : Webster's Revised Unabridged Dictionary (1913)

Rowel \Row"el\, v. t. [imp. & p. p. {Roweled}or {Rowelled}; p.
   pr. & vb. n. {Roweling} or {Rowelling}.] (Far.)
   To insert a rowel, or roll of hair or silk, into (as the
   flesh of a horse). --Mortimer.

Source : WordNet®

rowel
     n : a small spiked wheel at the end of a spur
     [also: {rowelling}, {rowelled}]

rowelled
     See {rowel}