TRACTRIX

Noun

tractrix (plural tractrices)

(geometry) 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.

Source: Wiktionary

Tract"rix, n. Etym: [NL. See Tractor.] (Geom.)

Definition: 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.

Source: Webster’s Unabridged Dictionary 1913 Edition

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