trac·trix | \ˈtraktriks\
plural tractrices\trakˈtrī(ˌ)sēz \

Definition of tractrix 

: 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

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History and Etymology for tractrix

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

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one that holds something together

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