from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A unit of measure equal to the solid angle subtended at the center of a sphere by an area on the surface of the sphere that is equal to the radius squared: The total solid angle of a sphere is 4π steradians. See Table at measurement.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In the International System of Units, the derived unit of solid angle; the solid angle subtended at the centre of a sphere of radius r by a portion of the surface of the sphere that has area r2. Symbol: sr
from The Century Dictionary and Cyclopedia
- n. A unit of solid angular measure; the solid angle subtended at the center by that part of a sphere which is equal to the square of its radius, hence by the unit surface on a sphere of unit radius.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the unit of solid angle adopted under the Systeme International d'Unites
ste(reo)- + radian.(American Heritage® Dictionary of the English Language, Fourth Edition)
ste(reo) + radian (Wiktionary)