thermal

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ther·mal / ˈ[unvoicedth]ərməl/ • adj. of or relating to heat. ∎ another term for geothermal. ∎  (of a garment) made of a fabric that provides exceptional insulation to keep the body warm: thermal underwear.• n. 1. an upward current of warm air, used by gliders, balloons, and birds to gain height.2. (usu. thermals) a thermal garment, esp. underwear.DERIVATIVES: ther·mal·ly adv.

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