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The property possessed by heat of being composed, like light, of rays of different degrees of refrangibility, which are unequal in rate or degree of transmission through diathermic substances.

A thermoelectric couple.

A current, as of electricity, developed, or set in motion, by the action of heat.

A white crystalline substance derived from urethane, used in medicine as an antipyretic, etc.

Relating to thermodynamics; caused or operated by force due to the application of heat. Thermodynamic function. See Heat weight, under Heat.

The science which treats of the mechanical action or relations of heat.

Pertaining to thermoelectricity; as, thermoelectric currents.

A union of two conductors, as bars or wires of dissimilar metals joined at their extremities, for producing a thermoelectric current.

Electricity developed in the action of heat. See the Note under Electricity.

An instrument for measuring the strength of an electric current in the heat which it produces, or for determining the heat developed by such a current.

Caloric; heat; regarded as a material but imponderable substance.

Relating to heat, or to the production of heat; producing heat; thermogenous; as, the thermogenic tissues.

Producing heat; thermogenic.

The trace or record made by means of a thermograph.

An instrument for automatically recording indications of the variation of temperature.

Any process of writing involving the use of heat.

A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple.

A discourse on, or an account of, heat. Whewell.

being moderately heated. It is shown esp. by certain substances that have been exposed to the action of light or to the cathode rays. ---lu`mi*nes"cent (#), a.

The resolution of a compound into parts by heat; dissociation by heat.