thermal

US /ˈθɜ:rml/

UK /ˈθɜ:ml/

B2
n. (c./u.)Noun (Countable/Uncountable)Item of warm clothing for cold weather use
You should wear thermals when it is really cold outside.
adj.AdjectiveOf or relating to heat or a source of heat
Under the lake was a natural thermal heat source, so the water was very warm
n. (c./u.)Noun (Countable/Uncountable)Rising body of warm air, e.g. in gliding
The bird found a thermal and floated higher in the sky on the warm air

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