row·el /ˈraʊ(ə)l/
 馬刺前端的小齒輪,排膿條(vt.)用馬刺前端踢,將排膿條插入


 Row·el n.
 1. The little wheel of a spur, with sharp points.
    With sounding whip, and rowels dyed in blood.   --Cowper.
 2. A little flat ring or wheel on horses' bits.
    The iron rowels into frothy foam he bit.   --Spenser.
 3. Far. A roll of hair, silk, etc., passed through the flesh of horses, answering to a seton in human surgery.


 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).

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