nonthermal

adjective
non·​ther·​mal | \ˌnän-ˈthər-məl \

Definition of nonthermal 

: not produced by heat specifically : of, relating to, or being radiation having a spectrum that is not the spectrum of a blackbody

First Known Use of nonthermal

circa 1964, in the meaning defined above

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The first known use of nonthermal was circa 1964

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