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solid angle

noun, Geometry.
an angle formed by three or more planes intersecting in a common point or formed at the vertex of a cone.
Origin of solid angle
First recorded in 1695-1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for solid angle

solid angle

a geometric surface consisting of lines originating from a common point (the vertex) and passing through a closed curve or polygon: measured in steradians
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
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solid angle in Science
solid angle  
A three-dimensional angle, formed by three or more planes intersecting at a common point. Its magnitude is measured in steradians, a unitless measure. The corner of a room forms a solid angle, as does the apex of a cone; one can imagine an indefinite number of planes forming the smooth round surface of the cone all intersecting at the apex. Solid angles are commonly used in photometry.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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