tibial spur

from The Collaborative International Dictionary of English v.0.48

Tibial \Tib"i*al\, a. [L. tibialis, fr. tibia the shin bone;
   also, a pipe or flute, originally made of a bone: cf. F.
   tibial.]
   1. Of or pertaining to a tibia.
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   2. Of or pertaining to a pipe or flute.
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   {Tibial spur} (Zool.), a spine frequently borne on the tibia
      of insects. See Illust. under {Coleoptera}.
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