Thermochemistry Ther`mo·chem"is·try noun [
Thermo- +
chemistry .]
That branch of chemical science which includes the investigation of the various relations existing between chemical action and that manifestation of force termed heat, or the determination of the heat evolved by, or employed in, chemical actions.
Thermochroic Ther`mo·chro"ic adjective [
Thermo- + Greek ..., ..., color.]
Pert. to or designating heat rays that have undergone selective absorption and are therefore analogous to colored light rays.
Thermochrosy Ther·moch"ro·sy noun [
Thermo- + Greek ... coloring.]
(Physics) 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.
Thermocouple Ther"mo·cou`ple noun A thermoelectric couple.
Thermocurrent Ther"mo·cur`rent noun [
Thermo- +
current .]
(Physics) A current, as of electricity, developed, or set in motion, by the action of heat.
Thermocurrent Ther"mo·cur`rent noun (Physics) A current developed or set in motion by heat; specif., an electric current, in a heterogeneous circuit, due to differences of temperature between the junctions of the substances of which the circuit is composed.
Thermodin Ther"mo·din noun [ G., from Greek ... heat.]
(Pharm.) A white crystalline substance derived from urethane, used in medicine as an antipyretic, etc.
Thermodynamic Ther`mo·dy·nam"ic adjective [
Thermo- +
dynamic .]
(Physics) Relating to thermodynamics; caused or operated by force due to the application of heat. Thermodynamic function .
See Heat weight , under Heat .
Thermodynamics Ther`mo·dy·nam"ics noun The science which treats of the mechanical action or relations of heat.
Thermoelectric Ther`mo·e·lec"tric adjective (Physics) Pertaining to thermoelectricity; as, thermoelectric currents.
Thermoelectric couple, pair Ther`mo·e·lec"tric couple, pair (Electricity) A union of two conductors, as bars or wires of dissimilar metals joined at their extremities, for producing a thermoelectric current.
Thermoelectricity Ther`mo·e`lec·tric"i·ty noun [
Thermo- +
electricity : confer French
thermoélectricité .]
(Physics) Electricity developed in the action of heat. See the Note under Electricity .
Thermoelectrometer Ther`mo·e`lec·trom"e·ter noun [
Thermo- +
electrometer .]
(Physics) 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.
Thermogen Ther"mo·gen noun [
Thermo- +
- gen .]
(Old Chem.) Caloric; heat; regarded as a material but imponderable substance.
Thermogenic Ther`mo·gen"ic adjective (Physiol.) Relating to heat, or to the production of heat; producing heat; thermogenous; as, the thermogenic tissues.
Thermogenous Ther·mog"e·nous adjective [
Thermo- +
-genous .]
(Physiol.) Producing heat; thermogenic.
Thermogram Ther"mo·gram noun (Physics) The trace or record made by means of a thermograph.
Thermograph Ther"mo·graph noun [
Thermo- +
- graph .]
(Physics) An instrument for automatically recording indications of the variation of temperature.
Thermography Ther·mog"ra·phy noun [
Thermo- +
-graphy .]
Any process of writing involving the use of heat.
Thermojunction Ther`mo·junc"tion noun (Electricity) A junction of two dissimilar conductors used to produce a thermoelectric current, as in one form of pyrometer; a thermocouple.
Thermology Ther·mol"o·gy (thẽr"mŏl"o*jȳ)
noun [
Thermo- +
-logy .]
A discourse on, or an account of, heat. Whewell.
Thermoluminescence Ther`mo·lu`mi·nes"cence noun (Physics) Luminescence exhibited by a substance on 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 adjective
Thermolysis Ther·mol"y·sis (-ĭ*sĭs)
noun [
Thermo- + Greek
ly`ein to loose.]
(Chemistry) The resolution of a compound into parts by heat; dissociation by heat.
Thermolytic Ther`mo·lyt"ic adjective Of or pertaining to thermolysis.
Thermolyze Ther"mo·lyze (thẽr"mo*līz)
transitive verb (Chemistry) To subject to thermolysis; to dissociate by heat.
Thermomagnetism Ther`mo·mag"net·ism (-măg"nĕt*ĭz'm)
noun [
Thermo- +
magnetism .]
Magnetism as affected or caused by the action of heat; the relation of heat to magnetism.
Thermometer Ther·mom"e·ter (thẽr*mŏm"e*tẽr)
noun [
Thermo- +
-meter : confer F. thermomètre. See
Thermal .]
(Physics) An instrument for measuring temperature, founded on the principle that changes of temperature in bodies are accompanied by proportional changes in their volumes or dimensions. » The
thermometer usually consists of a glass tube of capillary bore, terminating in a bulb, and containing mercury or alcohol, which expanding or contracting according to the temperature to which it is exposed, indicates the degree of heat or cold by the amount of space occupied, as shown by the position of the top of the liquid column on a graduated scale. See
Centigrade ,
Fahrenheit , and
Réaumur . To reduce degrees Fahrenheit to degrees Centigrade, substract 32° and multiply by &frac59;; to reduce degrees Centigrade to degrees Fahrenheit, multiply by &frac95; and add 32°.
Air thermometer ,
Balance thermometer ,
etc. See under Air , Balance , etc. --
Metallic thermometer ,
a form of thermometer indicating changes of temperature by the expansion or contraction of rods or strips of metal. --
Register thermometer , or
Self-registering thermometer ,
a thermometer that registers the maximum and minimum of temperature occurring in the interval of time between two consecutive settings of the instrument. A common form contains a bit of steel wire to be pushed before the column and left at the point of maximum temperature, or a slide of enamel, which is drawn back by the liquid, and left within it at the point of minimum temperature.
Thermometric, Thermometrical Ther`mo·met"ric, Ther`mo·met"ric·al adjective [ Confer French
thermométrique .]
1. Of or pertaining to a thermometer; as, the thermometrical scale or tube. 2. Made, or ascertained, by means of a thermometer; as, thermometrical observations.
Thermometrically Ther`mo·met"ric·al·ly adverb In a thermometrical manner; by means of a thermometer.
Thermometrograph Ther`mo·met"ro·graph noun [
Thermo- + Greek ... measure +
-graph .]
(Physics) An instrument for recording graphically the variations of temperature, or the indications of a thermometer.
Thermometry Ther·mom"e·try noun The estimation of temperature by the use of a thermometric apparatus.
Thermomotor Ther`mo·mo"tor noun A heat engine; a hot-air engine.
Thermomultiplier Ther`mo·mul"ti·pli`er noun [
Thermo- +
multiplier .]
Same as Thermopile .
Thermoneurosis Ther`mo·neu·ro"sis noun [ New Latin ]
(Medicine) (a) A neurosis caused by exposure to heat. (b) A neurosis causing rise or fall of a body's temperature.
Thermoneutrality Ther`mo·neu·tral"i·ty noun (Chemistry) Neutrality as regards heat effects.
Thermophilic Ther`mo·phil"ic adjective [
Thermo- + Greek ... loving +
-ic .]
Heat-loving; -- applied esp. to certain bacteria.
Thermophone Ther"mo·phone noun [
Thermo- +
phone .]
1. A portable form of telethermometer, using a telephone in connection with a differential thermometer. 2. A telephone involving heat effects, as changes in temperature (hence in length) due to pulsations of the line current in a fine wire connected with the receiver diaphragm.
Thermophore Ther"mo·phore noun [
Thermo- + Greek ... -bearing, from ... to bear.]
An apparatus for conveying heat, as a case containing material which retains its heat for a considerable period.
Thermopile Ther"mo·pile noun [
Thermo- +
pile a heap.]
(Physics) An instrument of extreme sensibility, used to determine slight differences and degrees of heat. It is composed of alternate bars of antimony and bismuth, or any two metals having different capacities for the conduction of heat, connected with an astatic galvanometer, which is very sensibly affected by the electric current induced in the system of bars when exposed even to the feeblest degrees of heat.
Thermoregulator Ther`mo·reg"u·la`tor noun (Physics) A device for the automatic regulation of temperature; a thermostat.
Thermoscope Ther"mo·scope noun [
Thermo- +
- scope .]
(Physics) An instrument for indicating changes of temperature without indicating the degree of heat by which it is affected; especially, an instrument contrived by Count Rumford which, as modified by Professor Leslie, was afterward called the differential thermometer .
Thermoscopic Ther`mo·scop"ic adjective (Physics) Of or pertaining to the thermoscope; made by means of the thermoscope; as, thermoscopic observations.
Thermosiphon Ther`mo·si"phon noun An arrangement of siphon tubes for assisting circulation in a liquid.
Thermostable Ther`mo·sta"ble adjective [
Thermo- +
stable fixed.]
(Physiol. Chem.) Capable of being heated to or somewhat above 55° C. without loss of special properties; -- said of immune substances, etc.
Thermostat Ther"mo·stat noun [
Thermo- + Greek ... to make to stand.]
(Physics) A self-acting apparatus for regulating temperature by the unequal expansion of different metals, liquids, or gases by heat, as in opening or closing the damper of a stove, or the like, as the heat becomes greater or less than is desired.
Thermostatic Ther`mo·stat"ic adjective (Physics) Of or pertaining to the thermostat; made or effected by means of the thermostat.
Thermosystaltic Ther`mo·sys·tal"tic adjective [
Thermo- +
systaltic .]
(Physiol.) Influenced in its contraction by heat or cold; -- said of a muscle.
Thermotactic Ther`mo·tac"tic adjective (Physiol.) Of or retaining to thermotaxis.
Thermotank Ther"mo·tank noun [
Thermo- +
ank .]
A tank containing pipes through which circulates steam, water, air, or the like, for heating or cooling; -- used in some heating and ventilation systems.
Thermotaxic Ther`mo·tax"ic adjective [
Thermo- + Greek ... arrangement.]
(Physiol.) Pertaining to, or connected with, the regulation of temperature in the animal body; as, the thermotaxic nervous system.
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