rowel

rowel
[ˈraʊ(ə)l]
noun
  1. a spiked revolving disc at the end of a spur
    (踢马刺末端的)齿轮,靴刺轮
(rowelled, rowelling; roweled, roweling)
  1. [with obj.]use a rowel to urge on (a horse)
    用靴刺轮刺促(马)
    he rowelled his horse on as fast as he could.
    他尽可能快地用靴刺轮刺促马。
语源
  1. Middle English: from Old French roel(e), from late Latin rotella, diminutive of Latin rota 'wheel'
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