black body

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black body

or

blackbody

n
(General Physics) physics a hypothetical body that would be capable of absorbing all the electromagnetic radiation falling on it. Also called: full radiator
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Noun1.black body - 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"
natural object - an object occurring naturally; not made by man