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Webster 1913 Edition

Thermal

Ther′mal

,
Adj.
[L.
thermae
hot springs, fr. Gr. [GREEK], pl. of [GREEK] heat, fr. [GREEK] hot, warm, [GREEK] 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
.
The
thermal
condition of the earth.
J. D. Forbes.
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
.

Webster 1828 Edition

Thermal

THER'MAL

,
Adj.
[L. thermoe, warm baths; Gr. to warm.]
Pertaining to heat; warm.
Thermal waters, are warm or tepid mineral waters, whose heat varies from 92 deg. to 112 deg.

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