bistoury
  外科用小刀
  bis·tou·ry /ˈbɪstərɪ/ 名詞
  細長(外科)刀,細長的
  Bis·tou·ry n.; pl. Bistouries   A surgical instrument consisting of a slender knife, either straight or curved, generally used by introducing it beneath the part to be divided, and cutting towards the surface.
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