Dictionary![]() ![]() ther•malPronunciation: (thûr'mul), [key] —adj. 1. Also,thermic.of, pertaining to, or caused by heat or temperature: thermal capacity. 2. of, pertaining to, or of the nature of thermae: thermal waters. 3. designed to aid in or promote the retention of body heat: a thermal blanket. —n. 1. Meteorol.a rising air current caused by heating from the underlying surface, esp. such a current when not producing a cloud. 2. thermals.See thermal underwear. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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