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radian

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ra⋅di⋅an

  [rey-dee-uhn]
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–noun Mathematics.
the measure of a central angle subtending an arc equal in length to the radius: equal to 57.2958°. Abbreviation: rad
Origin:
1875–80; radi(us) + -an
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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ra·di·an   (rā'dē-ən)   
n.   Abbr. rad
A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17'44.6". See Table at measurement.

[radi(us) + -an1.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: ra·di·an
Pronunciation: 'rAd-E-&n
Function: noun
: a unit of plane angular measurement that is equal to the angle at the centerof a circle subtended by an arc equal in length to the radius
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

radian ra·di·an (rā'dē-ən)
n.
Abbr. rad
A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
radian   (rā'dē-ən)  Pronunciation Key 
A supplementary unit of the International System used in angular measure. One radian is equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17'44.6".
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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