{ The"ri*ac (?), The*ri"a*cal (?), } a. [Cf. F. thériacal.] Of or
pertaining to theriac; medicinal. "Theriacal herbs." Bacon.
The"ri*al (?), a. Theriac. [R.] Holland.
The"ri*o*dont (?), n. (Paleon.) One of the Theriodontia. Used also
adjectively.
||The`ri*o*don"ta (?), n. pl. [NL.] (Paleon.) Same as Theriodontia.
||
||The`ri*o*don"ti*a (?), n. pl. [NL., fr. Gr. &?; (dim. of &?; a beast)
||+ &?;, &?;, a tooth.] (Paleon.) An extinct order of reptiles found in
||the Permian and Triassic formations in South Africa. In some respects
||they resembled carnivorous mammals. Called also Theromorpha.
||
They had biconcave vertebræ, ambulatory limbs, and a well- developed
pelvis and shoulder girdle. Some of the species had large maxillary
teeth. The head somewhat resembled that of a turtle. The Dicynodont is
one of the best-known examples. See Dicynodont.
The`ri*ot"o*my (?), n. [Gr. &?; wild beast + &?; to cut.] Zoötomy.
||Ther"mæ (?), n. pl. [L. See Thermal.] Springs or baths of warm or hot
||water.
||
Ther"mal (?), a. [L. thermae hot springs, fr. Gr. &?;, pl. of &?; heat,
fr. &?; hot, warm, &?; to warm, make hot; perhaps akin to L. formus
warm, and E. forceps.] 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.
Ther"mal*ly, adv. In a thermal manner.
Ther*met"o*graph (?), n. [Gr. &?; heat + &?; measure + -graph.] A
self-registering thermometer, especially one that registers the maximum
and minimum during long periods. Nichol.
Ther"mic (?), a. [Gr. &?; heat.] 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.
||Ther`mi`dor" (?), n. [F., fr. Gr. &?; warm, hot.] The eleventh month
||of the French republican calendar, — commencing July 19, and ending
||August 17. See the Note under Vendémiaire.
||
Ther*mif"u*gine (?), n. [Gr. &?; heat + L. fugere to flee.] (Chem.) An
artificial alkaloid of complex composition, resembling thalline and
used as an antipyretic, — whence its name.
Ther"mo- (?). A combining form from Gr. qe`rmh heat, qermo`s hot, warm;
as in thermochemistry, thermodynamic.
Ther`mo*ba*rom"e*ter (?), n. [Thermo- + barometer.] (Physics) An
instrument for determining altitudes by the boiling point of water.
Ther`mo*bat"ter*y (?), n. [Thermo- + battery.] A thermoelectric
battery; a thermopile.
Ther`mo*cau"ter*y (?), n. [Thermo- + cautery.] (Surg.) Cautery by the
application of heat.
Paquelin's thermocautery, thermocautery by means of a hollow platinum
point, which is kept constantly hot by the passage through it of
benzine vapor.
{ Ther`mo*chem"ic (?), Ther`mo*chem"ic*al (?), } a. (Chem. Physics) Of
or pertaining to thermochemistry; obtained by, or employed in,
thermochemistry.
Ther`mo*chem"is*try (?), n. [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.
Ther*moch"ro*sy (?), n. [Thermo- + Gr. &?; 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.
Ther"mo*cur`rent (?), n. [Thermo- + current.] (Physics) A current, as
of electricity, developed, or set in motion, by the action of heat.
Ther`mo*dy*nam"ic (?), a. [Thermo- + dynamic.] (Physics) Relating to
thermodynamics; caused or operated by force due to the application of
heat.
Thermodynamic function. See Heat weight, under Heat.
Ther`mo*dy*nam"ics (?), n. The science which treats of the mechanical
action or relations of heat.
Ther`mo*e*lec"tric (?), a. (Physics) Pertaining to thermoelectricity;
as, thermoelectric currents.
Ther`mo*e`lec*tric"i*ty (?), n. [Thermo- + electricity: cf. F.
thermoélectricité.] (Physics) Electricity developed in the action of
heat. See the Note under Electricity.
Ther`mo*e`lec*trom"e*ter (?), n. [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.
Ther"mo*gen (?), n. [Thermo- + - gen.] (Old Chem.) Caloric; heat;
regarded as a material but imponderable substance.
Ther`mo*gen"ic (?), a. (Physiol.) Relating to heat, or to the
production of heat; producing heat; thermogenous; as, the thermogenic
tissues.
Ther*mog"e*nous (?), a. [Thermo- + -genous.] (Physiol.) Producing heat;
thermogenic.
Ther"mo*graph (?), n. [Thermo- + - graph.] (Physics) An instrument for
automatically recording indications of the variation of temperature.
Ther*mol"o*gy (thr"ml"*j), n. [Thermo- + -logy.] A discourse on, or an
account of, heat. Whewell.
Ther*mol"y*sis (-*ss), n. [Thermo- + Gr. ly`ein to loose.] (Chem.) The
resolution of a compound into parts by heat; dissociation by heat.
Ther"mo*lyze (thr"m*lz), v. t. (Chem.) To subject to thermolysis; to
dissociate by heat.
Ther`mo*mag"net*ism (-mg"nt*z'm), n. [Thermo- + magnetism.] Magnetism
as affected or caused by the action of heat; the relation of heat to
magnetism.
Ther*mom"e*ter (thr*mm"*tr), n. [Thermo- + -meter: cf. 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 ; to reduce degrees Centigrade to degrees Fahrenheit,
multiply by 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.
{ Ther`mo*met"ric (?), Ther`mo*met"ric*al (?), } a. [Cf. F.
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.
Ther`mo*met"ric*al*ly (?), adv. In a thermometrical manner; by means of
a thermometer.
Ther`mo*met"ro*graph (?), n. [Thermo- + Gr. &?; measure + -graph.]
(Physics) An instrument for recording graphically the variations of
temperature, or the indications of a thermometer.
Ther*mom"e*try (?), n. The estimation of temperature by the use of a
thermometric apparatus.
Ther`mo*mul"ti*pli`er (?), n. [Thermo- + multiplier.] Same as
Thermopile.
Ther"mo*pile (?), n. [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.
Ther"mo*scope (?), n. [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.
Ther`mo*scop"ic (?), a. (Physics) Of or pertaining to the thermoscope;
made by means of the thermoscope; as, thermoscopic observations.
Ther"mo*stat (?), n. [Thermo- + Gr. &?; 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.
Ther`mo*stat"ic (?), a. (Physics) Of or pertaining to the thermostat;
made or effected by means of the thermostat.
Ther`mo*sys*tal"tic (?), a. [Thermo- + systaltic.] (Physiol.)
Influenced in its contraction by heat or cold; — said of a muscle.
Ther`mo*tax"ic (?), a. [Thermo- + Gr. &?; arrangement.] (Physiol.)
Pertaining to, or connected with, the regulation of temperature in the
animal body; as, the thermotaxic nervous system.
Ther`mo*ten"sion (?), n. [Thermo- + tension.] A process of increasing
the strength of wrought iron by heating it to a determinate
temperature, and giving to it, while in that state, a mechanical strain
or tension in the direction in which the strength is afterward to be
exerted.
{ Ther*mot"ic (?), Ther*mot"ic*al (?), } a. [Gr. &?; heat, fr. &?;
hot.] Of or pertaining to heat; produced by heat; as, thermotical
phenomena. Whewell.
Ther*mot"ics (?), n. The science of heat. Whewell.
Ther`mo*trop"ic (?), a. (Bot.) Manifesting thermotropism.
Ther*mot"ro*pism (?), n. [Thermo- + Gr. &?; to turn.] (Bot.) The
phenomenon of turning towards a source of warmth, seen in the growing
parts of some plants.
Ther"mo*type (?), n. [Thermo- + - type.] A picture (as of a slice of
wood) obtained by first wetting the object slightly with hydrochloric
or dilute sulphuric acid, then taking an impression with a press, and
next strongly heating this impression.
Ther*mot"y*py (?), n. The art or process of obtaining thermotypes.
Ther`mo*vol*ta"ic (?), a. [Thermo- + voltaic.] (Physics) Of or relating
to heat and electricity; especially, relating to thermal effects
produced by voltaic action. Faraday.
||The`ro*mor"pha (?), n. pl. [NL.: Gr. &?; beast + &?; form.] (Paleon.)
||See Theriodonta.
||
||The*rop"o*da (?), n. pl. [NL., fr. Gr. &?; a beast + &?;, &?;, foot.]
||(Paleon.) An order of carnivorous dinosaurs in which the feet are
||less birdlike, and hence more like those of an ordinary quadruped,
||than in the Ornithopoda. It includes the rapacious genera
||Megalosaurus, Creosaurus, and their allies.
||
||The*sau"rus (?), n.; pl. Thesauri (#). [L. See Treasure.] A treasury
||or storehouse; hence, a repository, especially of knowledge; — often
||applied to a comprehensive work, like a dictionary or cyclopedia.
||
These (z), pron. [OE. þes, þæs, a variant of þas, pl. of þes, thes,
this. See This, and cf. Those.] The plural of this. See This.
Thes"i*cle (?), n. [Dim. of thesis.] A little or subordinate thesis; a
proposition.
The"sis (?), n.; pl. Theses (#). [L., fr. Gr. &?;, fr. &?; to place,
set. See Do, and cf. Anathema, Apothecary, Epithet, Hypothesis,
Parenthesis, Theme, Tick a cover.] 1. A position or proposition which a
person advances and offers to maintain, or which is actually maintained
by argument.
2. Hence, an essay or dissertation written upon specific or definite
theme; especially, an essay presented by a candidate for a diploma or
degree.
I told them of the grave, becoming, and sublime deportment they should
assume upon this mystical occasion, and read them two homilies and a
thesis of my own composing, to prepare them.
Goldsmith.
3. (Logic) An affirmation, or distinction from a supposition or
hypothesis.
4. (Mus.) The accented part of the measure, expressed by the downward
beat; — the opposite of arsis.
5. (Pros.) (a) The depression of the voice in pronouncing the syllables
of a word. (b) The part of the foot upon which such a depression falls.
Thes"mo*thete (?), n. [Gr. &?;; &?; that which is established, a law
(fr. &?; to set) + &?; a giver (also fr. &?;).] (Gr. Antiq.) A
lawgiver; a legislator; one of the six junior archons at Athens.
Thes"pi*an (?), a. [From L. Thespis, Gr. &?;, the founder of the Greek
drama.] Of or pertaining to Thespis; hence, relating to the drama;
dramatic; as, the Thespian art. — n. An actor.
Thes*sa"li*an (?), a. [Cf. L. Thessalius.] Of or pertaining to Thessaly
in Greece. Shak. — n. A native or inhabitant of Thessaly.
Thes`sa*lo"ni*an (?), a. Of or pertaining to Thessalonica, a city of
Macedonia. — n. A native or inhabitant of Thessalonica.
The"ta (?), n. [L., fr. Gr. qh^ta, the Greek letter θ, .] A letter of
the Greek alphabet corresponding to th in English; — sometimes called
the unlucky letter, from being used by the judges on their ballots in
passing condemnation on a prisoner, it being the first letter of the
Greek qa`natos, death.
Theta function (Math.), one of a group of functions used in developing
the properties of elliptic functions.
Thet"ic*al (?), a. [Gr. &?; fit for placing, fr. &?; to set, lay down.
See Thesis.] Laid down; absolute or positive, as a law. Dr. H. More.
The"tine (?), n. [Thio + ether + sulphine.] (Chem.) Any one of a series
of complex basic sulphur compounds analogous to the sulphines.
{ The*ur"gic (?), The*ur"gic*al (?), } a. [L. theurgicus, Gr. &?;: cf.
F. théurgique.] Of or pertaining to theurgy; magical.
Theurgic hymns, songs of incantation.
The"ur*gist (?), n. [Cf. F. théurgiste.] One who pretends to, or is
addicted to, theurgy. Hallywell.
<! p. 1498 !>
The"ur*gy (th"r*j), n. [L. theurgia, Gr. qeoyrgi`a, fr. qeoyrgo`s doing
the works of God; qeo`s God + 'e`rgon work: cf. F. théurgie. See
Theism, and Work.] 1. A divine work; a miracle; hence, magic; sorcery.
2. A kind of magical science or art developed in Alexandria among the
Neoplatonists, and supposed to enable man to influence the will of the
gods by means of purification and other sacramental rites.
Schaff-Herzog Encyc.
3. In later or modern magic, that species of magic in which effects are
claimed to be produced by supernatural agency, in distinction from
natural magic.
Thew (th), n. [Chiefly used in the plural Thews (thz).] [OE. thew,
þeau, manner, habit, strength, AS. þeáw manner, habit (cf. þwan to
drive); akin to OS. thau custom, habit, OHG. dou. √56.] 1. Manner;
custom; habit; form of behavior; qualities of mind; disposition;
specifically, good qualities; virtues. [Obs.]
For her great light Of sapience, and for her thews clear.
Chaucer.
Evil speeches destroy good thews.
Wyclif (1 Cor. xv. 33).
To be upbrought in gentle thews and martial might.
Spenser.