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evolute

noun
evo·​lute | \ ˈe-və-ˌlüt also ˈē-və- How to pronounce evolute (audio) \

Definition of evolute

: the locus of the center of curvature or the envelope of the normals of a curve

First Known Use of evolute

1704, in the meaning defined above

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The first known use of evolute was in 1704

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