tractrix

Noun

 * 1)  A curve that satisfies the following property: that segment of the tangent line that lies between the point of tangency and a fixed line has length independent of the point of tangency chosen.

Translations

 * French:
 * German: Traktrix
 * Ido:
 * Italian: trattrice
 * Polish: traktrysa
 * Spanish: tractriz