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tractrix

[trak-triks] /ˈtræk trɪks/
noun, plural tractrices
[trak-trahy-seez, trak-truh-seez] /trækˈtraɪ siz, ˈtræk trəˌsiz/ (Show IPA).
Geometry
1.
a curve whose tangents are all of equal length; the involute of a catenary.
Origin
1720-1730
1720-30; < Neo-Latin, equivalent to Latin trac-, variant stem of trahere to draw, pull + -trīx -trix
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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