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 (ĕv′ə-lo͞ot′, ē′və-)
n. Mathematics
The locus of the centers of curvature of a given curve.

[From Latin ēvolūtus, past participle of ēvolvere, to unroll; see evolve.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Mathematics) 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
(Biology) biology having the margins rolled outwards
[C19: from Latin ēvolūtus unrolled, from ēvolvere to roll out, evolve]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈɛv əˌlut; esp. Brit. ˈi və-)

Geom. 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; see evolve]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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