thermal

 
Pronunciation: /ˈθəːm(ə)l/

adjective

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

noun

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

Derivatives

thermally

adverb

Origin:

mid 18th century (in the sense 'relating to hot springs'): from French, from Greek thermē 'heat'