tractrix

POS

Adjective, Noun, Verb (intransitive), Verb (transitive)

HYPHEN

trac=trix

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CIDE DICTIONARY

tractrix, n. [NL. See Tractor.].

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. [1913 Webster]

For further exploring for "tractrix" in Webster Dictionary Online

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