solid angle

WordReference Random House Unabridged Dictionary of American English © 2025

sol′id an′gle, [Geom.]

1. Mathematics an angle formed by three or more planes intersecting in a common point or formed at the vertex of a cone.

• 1695–1705

Collins Concise English Dictionary © HarperCollins Publishers::

solid angle noun

1. a geometric surface consisting of lines originating from a common point (the vertex) and passing through a closed curve or polygon: measured in steradians