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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 comm…

In a thermal manner.

Freely permeable by radiant heat.

Warm-blooded; homoiothermal.

Warm-blooded; hematothermal. [R]

Warm-blooded.

See Homoiothermal.

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…

Of or pertaining to hot water; -- used esp. with reference to the action of heated waters in dissolving, redepositing, and otherwise producing mineral changes within the crust of the globe.

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

Relating to equality of temperature.

Having a varying body temperature. See Homoiothermal.

Having the same degree of heat.

A thermal cymoscope which operates by increased resistance when subjected to the influence of electric waves. The original form consisted of an extremely fine platinum wire loop attached to terminals and inclosed in a small glass or silver bulb. In a later variety, called the liquid barretter, wire is replace by a colu…

in which the working fluid goes through the following four successive operations: (1) Isothermal expansion to a desired point; (2) adiabatic expansion to a desired point; (3) isothermal compression to such a point that (4) adiabatic compression brings it back to its initial state.

r power of conducting, or of receiving and transmitting, as, the conductivity of a nerve. Thermal conductivity (Physics), the quantity of heat that passes in unit time through unit area of plate whose thickness is unity, when its opposite faces differ in temperature by one degree. J. D. Everett. -- Thermometic conduct…

Having the property of transmitting radiant heat; diathermal; - - opposed to athermanous.

An instrument for examining the thermal resistance or heat- conducting power of liquids.

Same as Diathermal.

automatically sprayed into the cylinder under pressure. The Diesel engine has a very high thermal efficiency.