[ev-uh-loot or, esp. British, ee-vuh-]
noun Geometry.
the locus of the centers of curvature of, or the envelope of the normals to, another curve. Compare involute ( def 5 ).

1720–30; < Latin ēvolūtus (past participle of ēvolvere to roll out, unfold, evolve)

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World English Dictionary
evolute (ˈɛvəˌluːt)
1.  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
2.  biology having the margins rolled outwards
[C19: from Latin ēvolūtus unrolled, from ēvolvere to roll out, evolve]

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