- a body that emits only a fraction of the thermal energy emitted by an equivalent blackbody. By definition, a graybody has a surface emissitivy less than 1, and a surface reflectivity greater than zero.
Mechanics glossary. 2013.
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graybody — noun a body that radiates energy having a blackbody distribution reduced by a constant factor … Wiktionary
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body — blackbody graybody … Mechanics glossary