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tractrix

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trac⋅trix

[trak-triks]
–noun, plural trac⋅tri⋅ces [trak-trahy-seez, trak-truh-seez] . Geometry.
a curve whose tangents are all of equal length; the involute of a catenary.

Origin:
1720–30; < NL, equiv. to L trac-, var. s. of trahere to draw, pull + -trīx -trix
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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