Pertaining to heat.
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ther·mal 'thər-məl adj
1) of, relating to, or caused by heat <tactile and \thermal senses>
2) being or involving a state of matter dependent upon temperature <\thermal agitation of molecular structure>
ther·mal·ly -mə-lē adv
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ther·mal (thurґməl) 1. pertaining to or characterized by heat.Medical dictionary. 2011.