emissivity
noun
emis·siv·i·ty
ˌe-mə-ˈsi-və-tē
ˌē-ˌmi-ˈsi-
plural emissivities
: the relative power of a surface to emit heat by radiation : the ratio of the radiant energy emitted by a surface to that emitted by a blackbody at the same temperature
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Merriam-Webster unabridged
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