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Of or pertaining to heat; due to heat; thermal; as, thermic lines. Thermic balance. See Bolometer. -- Thermic fever (Med.), the condition of fever produced by sunstroke. See Sunstroke. -- Thermic weight. (Mech.) Same as Heat weight, under Heat.

Not pervious to heat.

Affording a free passage to heat; as, diathermic substances. Melloni.

o, a reaction which occurs with absorption of heat; formed by such a reaction; as, an endothermic substance; -- opposed to exothermic.

Characterized by, or formed with, evolution of heat; as, an exothermic reaction; -- opposed to endothermic.

Warm-blooded; homoiothermal; hæmatothermal.

Self-heating; warmed, as the body of animal, by process going on within itself.

Of or pertaining to an isobathytherm; possessing or indicating the same temperature at the same depth.

Pertaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. -- n.

Of or pertaining to both light and heat.

Having a varying body temperature. See Homoiothermal.

iant heat, especially in different parts of the spectrum; -- called also actinic balance, thermic balance. S. P. Langley.

Maintaining a uniform temperature; hæmatothermal; homothermic; -- applied to warm-bodied animals, because they maintain a nearly uniform temperature in spite of the great variations in the surrounding air; in distinct from the cold-blooded (poikilothermal) animals, whose body temperature follows the variations in tempe…

Impervious to heat; adiathermic.

degrees of refrangibility, which are unequal in rate or degree of transmission through diathermic substances.

ralization that: when a system is in equilibrium, of the two opposed interactions the endothermic is promoted by raising the temperature, the exothermic by lowering it.