graybody

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graybody — 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
graybody — noun a body that radiates energy having a blackbody distribution reduced by a constant factor … Wiktionary
Emissivity — The emissivity of a material (usually written ε or e) is the relative ability of its surface to emit energy by radiation. It is the ratio of energy radiated by a particular material to energy radiated by a black body at the same temperature. A… … Wikipedia
Flare (countermeasure) — A Lockheed AC 130U Spooky releasing decoy flares. An IAF AH 64 Apache releasing decoy flares. A (decoy) flare is an aerial infrared countermeasure … Wikipedia
body — blackbody graybody … Mechanics glossary

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