tractrix
/'træktriks/
📖 中文释义
- 等切面曲线, 曳物线
📘 English Definition（英文释义）
- n. A curve such that the part of the tangent between the
- point of tangency and a given straight line is constant; -- so called
- because it was conceived as described by the motion of one end of a
- tangent line as the other end was drawn along the given line.