tractrix

noun

trac·​trix

ˈtraktriks

plural tractrices

trakˈtrī(ˌ)sēz

: a curve in which the part of the tangent between the point of tangency and a given straight line is constant and which is an involute of a catenary

Word History

Etymology

New Latin, from Latin tractus (past participle of trahere to draw) + -trix

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