tractrix
/ˈtræktrɪks/noun
(pl. tractrices /-trɪsiːz/)
1- Geometry a curve whose tangents all intercept the x-axis at the same distance from the point of contact, being the involute of a catenary【几何】曳物线, 等切面曲线。
1.1
- 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曳物线。
词源
early 18th cent.: modern Latin, feminine of late Latin tractor 'that which pulls' （see TRACTOR）.