evolute

[ev-uh-loot or, esp. British, ee-vuh-]
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noun Geometry.

the locus of the centers of curvature of, or the envelope of the normals to, another curve.Compare involute(def 5).

Origin of evolute

1720–30; < Latin ēvolūtus (past participle of ēvolvere to roll out, unfold, evolve)
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British Dictionary definitions for evolute

evolute

noun

a geometric curve that describes the locus of the centres of curvature of another curve (the involute). The tangents to the evolute are at right angles to the involute

adjective

biology having the margins rolled outwards

Word Origin for evolute

C19: from Latin ēvolūtus unrolled, from ēvolvere to roll out, evolve
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012