tractrix

[ trak-triks ]
/ ˈtræk trɪks /

noun, plural trac·tri·ces [trak-trahy-seez, trak-truh-seez]. /trækˈtraɪ siz, ˈtræk trəˌsiz/. Geometry.

a curve whose tangents are all of equal length; the involute of a catenary.

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Origin of tractrix

1720–30; <New Latin, equivalent to Latin trac-, variant stem of trahere to draw, pull + -trīx-trix
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020