Definition of "thermals" [thermals]

• Plural form of thermal. (noun)
• Thermal underwear (noun)

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• "Once high enough, the pilot detaches from the towline to begin the search for the rising columns of air, known as thermals, that can keep the sailplane aloft for hours."
• "Is net convection between surface and lower atmosphere really limited to that little flow called 'thermals'?"
• "Once spring gets nearer, the higher sun angle warms the Earth more readily and this causes rising columns of air called "thermals"."