giving off radiation.
Also, radiatory [rey-dee-uh-tawr-ee, -tohr-ee] .

1830–40; radiat(ion) + -ive

nonradiative, adjective
subradiative, adjective
unradiative, adjective
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World English Dictionary
radiative or radiatory (ˈreɪdɪətɪv, ˈreɪdɪətərɪ, -trɪ)
physics emitting or causing the emission of radiation: a radiative collision
radiatory or radiatory

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Outside the core, the sun has a relatively quiet radiative zone.
The radiative effects of water and clouds are at a maximum in this region.
Changes in climate are drive by long-term changes in the sun's radiative output
  and magnetic field strength.
The heating rate due to the divergence of long and shortwave radiative flux.
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