Definitions of thermal

  1. caused by or designed to retain heat; " thermal springs"; " a thermal burn"; " thermal underwear"
  2. Of or pertaining to heat; warm; hot; as, the thermal unit; thermal waters.
  3. Of or pertaining to heat; as, thermal units; warm; hot; as, thermal baths. Also, thermic.
  4. Pertaining to, determined by, or measured by heat.
  5. Pertaining to heat; warm. Thermal waters, warm mineral waters or springs.
  6. Of or pert, to heat; warm- applied to springs above 60° Fahr.