Try Our Apps


Is irregardless a word?


[stuh-rey-dee-uh n] /stəˈreɪ di ən/
noun, Geometry.
a solid angle at the center of a sphere subtending a section on the surface equal in area to the square of the radius of the sphere.
Abbreviation: sr.
Origin of steradian
1880-85; ste(reo)- + radian Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
Cite This Source
British Dictionary definitions for steradian


an SI unit of solid angle; the angle that, having its vertex in the centre of a sphere, cuts off an area of the surface of the sphere equal to the square of the length of the radius sr
Word Origin
C19: from stereo- + radian
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
steradian in Science
A unitless measure of solid angles. A solid angle projecting from the center of a sphere and cutting its surface has a measure of s/r2 steradians, where s is the surface area of the sphere cut out by the solid angle, and r is the radius of the sphere. See also radian.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for steradian

Few English speakers likely know this word

Word Value for steradian

Scrabble Words With Friends

Nearby words for steradian