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The Collaborative International Dictionary of English v.0.48 (gcide)

Thermal \Ther"mal\, a. [L. thermae hot springs, fr. Gr. ?, pl.
of ? heat, fr. ? hot, warm, ? to warm, make hot; perhaps akin
to L. formus warm, and E. forceps.]
1. Of or pertaining to heat; warm; hot; as, the thermal unit;
thermal waters.
[1913 Webster]

The thermal condition of the earth. --J. D.
Forbes.
[1913 Webster]

2. caused by or affected by heat; as, thermal springs.
[PJC]

3. designed to retain heat; as, thermal underwear.
[PJC]

{Thermal conductivity}, {Thermal spectrum}. See under
{Conductivity}, and {Spectrum}.

{Thermal unit} (Physics), a unit chosen for the comparison or
calculation of quantities of heat. The unit most commonly
employed is the amount of heat necessary to raise the
temperature of one gram or one pound of water from zero to
one degree Centigrade. See {Calorie}, and under {Unit}.
[1913 Webster]