tract-rices

tractrix

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

Origin:
1720–30; < Neo-Latin, equivalent to Latin trac-, variant stem of trahere to draw, pull + -trīx -trix

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