evolute

 [ev-uh-loot or, especially Brit., ee-vuh-]  

ev·o·lute

   [ev-uh-loot or, especially Brit., 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).
Origin:
1720–30; < Latin ēvolūtus (past participle of ēvolvere to roll out, unfold, evolve)
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Evolute is always a great word to know.
So is zedonk. Does it mean:
a chattering or flighty, light-headed person.
the offspring of a zebra and a donkey.
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Collins
World English Dictionary
evolute (ˈɛvəˌluːt)
 
—n
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
 
—adj
2.  biology having the margins rolled outwards
 
[C19: from Latin ēvolūtus unrolled, from ēvolvere to roll out, evolve]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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