blackbody radiation

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The electromagnetic radiation given off by a theoretical blackbody, its average frequency increasing as the blackbody's temperature increases.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the electromagnetic radiation that would be radiated from an ideal black body; the distribution of energy in the radiated spectrum of a black body depends only on temperature and is determined by Planck's radiation law