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   thermal

   /ˈθəːml/

   adjective

   • 1. relating to heat: "thermal conductivity"
   • ▪ another term for geothermal
   • ▪ (of a garment) made of a fabric that provides exceptional insulation to keep the body warm: "thermal underwear"

   noun

   • 1. an upward current of warm air, used by gliders, balloonists, and birds to gain height.
   • 2. a thermal garment, especially underwear.

   Word Origin mid 18th century (in the sense ‘relating to hot springs’): from French, from Greek thermē ‘heat’.

   Derivatives

   • 1. thermally adverb

   Scrabble Points: 12

   • T

     1

   • H

     4

   • E

     1

   • R

     1

   • M

     3

   • A

     1

   • L

     1

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