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.

1695–1705 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
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 10th Edition
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American Heritage
Science Dictionary
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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Example sentences
Development of high intense surface muon beam using a large solid angle axial focusing channel.
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