thermal
1ther·mal
adj \ˈthər-məl\Definition of THERMAL
1
[Latin thermae public baths, from Greek thermai, plural of thermē] : of, relating to, or marked by the presence of hot springs <thermal waters>
2
a : of, relating to, or caused by heat <thermal stress> <thermal insulation> b : being or involving a state of matter dependent upon temperature <thermal conductivity> <thermal agitation of molecular structure> c : having low energies of the order of those due to thermal agitation <thermal neutrons>
3
: designed (as with insulating air spaces) to prevent the dissipation of body heat <thermal underwear>
— ther·mal·ly \-mə-lē\ adverb
Origin of THERMAL
Greek thermē
First Known Use: 1742
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