"thermal" in the noun sense
1. thermal
rising current of warm air
"thermal" in the adjective sense
1. thermal, thermic, caloric
relating to or associated with heat
"thermal movements of molecules"
"thermal capacity"
"thermic energy"
"the caloric effect of sunlight"
2. thermal
of or relating to a hot spring
"thermal water"
3. thermal
caused by or designed to retain heat
"a thermal burn"
"thermal underwear"
Source: WordNet® (An amazing lexical database of English)
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