Meaning of “thermal” in the English Dictionary

(Definition of “thermal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"thermal" in American English

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thermaladjective

us /ˈθɜr·məl/

of, connected with, or preserving heat

Thermal underwear is underwear that has been specially designed to keep you warm.

(Definition of “thermal” from the Cambridge Academic Content Dictionary © Cambridge University Press)