a hypothetical object capable of absorbing all the electromagnetic radiation falling on it

a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium

Syn: ↑black body, ↑full radiator
Hypernyms: ↑natural object

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\\ˈ ̷ ̷| ̷ ̷ ̷ ̷\ noun
: an ideal body or surface that completely absorbs all radiant energy of any wavelength falling upon it with no reflection of energy, the temperature on the absolute scale being determined by measuring the intensity and spectral distribution of the radiated energy

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/blak"bod"ee/, n., pl. blackbodies. Physics.
a hypothetical body that absorbs without reflection all of the electromagnetic radiation incident on its surface. Also called perfect radiator.

Useful english dictionary. 2012.