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1. Oxford Dictionary

   tractrix

   • IPA[ˈtraktrɪks]

   英式

   • n.
     a curve whose tangents all intercept the x -axis at the same distance from the point of contact, being the involute of a catenary.；one of a class of curves similarly traced by one end of a rigid rod, whose other end moves along a fixed line or curve.

   • noun: tractrix, plural noun: tractrices

2. • 更多解釋

   tractrix

   • IPA[ˈtraktriks]

   美式

   • n.
     a curve whose tangents all intercept the x -axis at the same distance from the point of ...

   Oxford American Dictionary