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say it: THUR-muhl
thermal is an adjective and noun meaning "relating to or associated with heat". It carries 4 recorded senses.
relating to or associated with heat
“thermal movements of molecules”
“thermal capacity”
“thermic energy”
“the caloric effect of sunlight”
of or relating to a hot spring
“thermal water”
caused by or designed to retain heat
“a thermal burn”
“thermal underwear”
rising current of warm air
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for thermal come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.