■ adjective
1》 relating to heat.
↘another term for geo~ .
↘ Physics relating to or denoting particles in thermodynamic equilibrium with their surroundings: ~ neutrons.
2》 (of a garment) made of a fabric that provides good insulation to keep the body warm.
■ noun
1》 an upward current of warm air, used by birds, gliders, and balloonists to gain height.
2》 ( ~s ) ~ garments, especially underwear.
Derivatives
~ly adverb
Origin
C18 (in the sense 'relating to hot springs'): from Fr., from Gk thermē 'heat'.