non·ther·mal adjective \-ˈthər-məl\
: 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
Learn More About NONTHERMAL
Seen & Heard
What made you want to look up nonthermal? Please tell us where you read or heard it (including the quote, if possible).