evolute

American  

[ev-uh-loot, ee-vuh-] / ˈɛv əˌlut, ˈi və- /

noun

Geometry.

1. the locus of the centers of curvature of, or the envelope of the normals to, another curve.

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evolute British  

/ ˈɛvəˌluːt /

noun

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

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adjective

1. biology having the margins rolled outwards

Etymology

Origin of evolute

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

Example Sentences

Both of these liquids have specific pericosities given by P = 2.5C.n^6-7 where n is the diathetical evolute of retrograde temperature phase disposition and C is Cholmondeley's annular grillage coefficient.

From Time Magazine Archive

The thread has a marker, E, so that when the thread is wound on the spool the marker E makes the evolute line A. 163.

From Carpentry for Boys In a Simple Language, Including Chapters on Drawing, Laying Out Work, Designing and Architecture With 250 Original Illustrations by Zerbe, James Slough

The pleasing effect of the design at Seventh and Locust streets is largely due to appropriate use of the evolute spiral band.

From The Colonial Architecture of Philadelphia by Cousins, Frank

Matter did not create itself, nor evolute nor grow.

From The Evolution of Man Scientifically Disproved In 50 Arguments by Williams, William A. (William Asbury)

The evolute of a curve is the curve which is the envelope of all its normals or the locus of all its centres of curvature.

From The New Gresham Encyclopedia Volume 4, Part 3: Estremoz to Felspar by Various