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thermal (adj) pertaining to heat.
Anything connected with heat is thermal. Thermal energy is heat energy. Thermal noon is the time of the day when it is the hottest. Thermal springs are springs in which the water is naturally heat by the earth.
- They carried sufficient thermal wear with them, as the place they were going to was very cold. The thermal wear are specially designed to keep them warm in the cold weather.
- It became a tourist attraction after people had come to know about the thermal springs there. The water in these springs is naturally hot.