evolute


Concise Oxford English Dictionary © 2008 Oxford University Press:
evolute /ˈiːvəl(j)uːt, ˈɛv-/
noun Mathematics a curve which is the locus of the centres of curvature of another curve (its involute). adjective Zoology & Botany rolled outwards at the edges.
– origin C18: from L. evolutus, past part. of evolvere (see evolve).
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