1
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
2
: designed (as with insulating air spaces) to prevent the dissipation of body heat
thermal underwear
3
[Latin thermae public baths, from Greek thermai, plural of thermē]
: of, relating to, or marked by the presence of hot springs
thermal waters
: a rising body of warm air
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Merriam-Webster unabridged
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