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English definition of “thermal”

thermal

adjective [always before noun]     /ˈθɜːməl/
HEAT relating to heat : thermal energy Hot and heatSultriness and humidity
CLOTHES Thermal clothes are made to keep you warm : thermal underwear Hot and heatSultriness and humidityClothing - general words
(Definition of thermal adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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