Webster's Dictionary, 1913

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Thermophone 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 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 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 noun (Physics) A device for the automatic regulation of temperature; a thermostat.

Thermoscope 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 adjective (Physics) Of or pertaining to the thermoscope; made by means of the thermoscope; as, thermoscopic observations.

Thermosiphon noun An arrangement of siphon tubes for assisting circulation in a liquid.

Thermostable 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 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 adjective (Physics) Of or pertaining to the thermostat; made or effected by means of the thermostat.

Thermosystaltic adjective [ Thermo- + systaltic .] (Physiol.) Influenced in its contraction by heat or cold; -- said of a muscle.

Thermotactic adjective (Physiol.) Of or retaining to thermotaxis.

Thermotank 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 adjective [ Thermo- + Greek ... arrangement.] (Physiol.) Pertaining to, or connected with, the regulation of temperature in the animal body; as, the thermotaxic nervous system.

Thermotaxis noun [ New Latin ; thermo- + Greek ... an arranging.] (Physiol.) (a) The property possessed by protoplasm of moving under the influence of heat. (b) Determination of the direction of locomotion by heat.

Thermotensile adjective Pertaining to the variation of tensile strength with the temperature.

Thermotension noun [ 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.

Thermotherapy noun [ Thermo- + therapy .] (Medicine) Treatment of disease by heat, esp. by hot air.

Thermotic, Thermotical adjective [ Greek ... heat, from ... hot.] Of or pertaining to heat; produced by heat; as, thermotical phenomena. Whewell.

Thermotics noun The science of heat. Whewell.

Thermotonus noun [ New Latin ; thermo- + tonus .] (Plant Physiol.) A condition of tonicity with respect to temperature.

Thermotropic adjective (Botany) Manifesting thermotropism.

Thermotropism noun [ Thermo- + Greek ... to turn.] (Botany) The phenomenon of turning towards a source of warmth, seen in the growing parts of some plants.

Thermotype noun [ 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.

Thermotypy noun The art or process of obtaining thermotypes.

Thermovoltaic adjective [ Thermo- + voltaic .] (Physics) Of or relating to heat and electricity; especially, relating to thermal effects produced by voltaic action. Faraday.

Theroid adjective [ Greek qh`r , qhro`s , wild beast + -oid .] (Medicine) Resembling a beast in nature or habit; marked by animal characteristics; as, theroid idiocy.

Theromorpha noun plural [ New Latin : Greek ... beast + ... form.] (Paleon.) See Theriodonta .

Theropoda noun plural [ New Latin , from Greek ... 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.

Thesaurus noun ; plural Thesauri . [ Latin See Treasure .] A treasury or storehouse; hence, a repository, especially of knowledge; -- often applied to a comprehensive work, like a dictionary or cyclopedia.

These (&thlig;ēz) pron. [ Middle English þes , þæs , a variant of þas , plural of þes , thes , this. See This , and confer Those .] The plural of this . See This .

Thesicle noun [ Dim. of thesis .] A little or subordinate thesis; a proposition.

Thesis noun ; plural Theses . [ Latin , from Greek ..., from ... to place, set. See Do , and confer 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.

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.

Thesmothete noun [ Greek ...; ... that which is established, a law (fr. ... to set) + ... a giver (also from ...).] (Gr. Antiq.) A lawgiver; a legislator; one of the six junior archons at Athens.

Thespian adjective [ From Latin Thespis , Greek ..., the founder of the Greek drama.] Of or pertaining to Thespis; hence, relating to the drama; dramatic; as, the Thespian art. -- noun An actor.

Thessalian adjective [ Confer Latin Thessalius .] Of or pertaining to Thessaly in Greece. Shak. -- noun A native or inhabitant of Thessaly.

Thessalonian adjective Of or pertaining to Thessalonica, a city of Macedonia. -- noun A native or inhabitant of Thessalonica.

Theta noun [ Latin , from Greek qh^ta , the Greek letter θ, 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.

Thetical adjective [ Greek ... fit for placing, from ... to set, lay down. See Thesis .] Laid down; absolute or positive, as a law. Dr. H. More.

Thetine noun [ Th io + et her + sulph ine .] (Chemistry) Any one of a series of complex basic sulphur compounds analogous to the sulphines.

Theurgic, Theurgical adjective [ Latin theurgicus , Greek ...: confer French théurgique .] Of or pertaining to theurgy; magical.

Theurgic hymns , songs of incantation.

Theurgist noun [ Confer French théurgiste .] One who pretends to, or is addicted to, theurgy. Hallywell.

Theurgy (thē"ŭr*jȳ) noun [ Latin theurgia , Greek qeoyrgi`a , from qeoyrgo`s doing the works of God; qeo`s God + 'e`rgon work: confer French 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 (thū) noun [ Chiefly used in the plural Thews (thūz).] [ Middle English thew , þeau , manner, habit, strength, Anglo-Saxon þeáw manner, habit (cf. þȳwan to drive); akin to Old Saxon thau custom, habit, Old High German dou . √56.]
1. Manner; custom; habit; form of behavior; qualities of mind; disposition; specifically, good qualities; virtues. [ Obsolete]

For her great light
Of sapience, and for her thews clear.

Evil speeches destroy good thews .
Wyclif (1 Cor. xv. 33).

To be upbrought in gentle thews and martial might.

2. Muscle or strength; nerve; brawn; sinew. Shak.

And I myself, who sat apart
And watched them, waxed in every limb;
I felt the thews of Anakim,
The pules of a Titan's heart.

Thewed (thūd) adjective
1. Furnished with thews or muscles; as, a well- thewed limb.

2. Accustomed; mannered. [ Obsolete] John Skelton.

Yet would not seem so rude and thewed ill.

Thewy adjective Having strong or large thews or muscles; muscular; sinewy; strong.

They (&thlig;ā) pron. plural ; poss. Theirs ; obj. Them . [ Icelandic þeir they, properly nom. plural masc. of , , þat , a demonstrative pronoun, akin to the English definite article, Anglo-Saxon , seó , ðæt , nom. plural ðā . See That .] The plural of he , she , or it . They is never used adjectively, but always as a pronoun proper, and sometimes refers to persons without an antecedent expressed.

Jolif and glad they went unto here [ their] rest
And casten hem [ them] full early for to sail.

They of Italy salute you.
Hebrew xiii. 24.

Blessed are they which do hunger and thirst after righteousness.
Matt. v. 6.

» They is used indefinitely, as our ancestors used man , and as the French use on ; as, they say (French on dit ), that is, it is said by persons not specified.

Thialdine noun [ Thio- + al dehyde + -ine .] (Chemistry) A weak nitrogenous sulphur base, C 6 H 13 NS 2 .

Thialol noun [ Thio- + al cohol + Latin ol eum oil.] (Chemistry) A colorless oily liquid, (C 2 H 5 ) 2 S 2 , having a strong garlic odor; -- called also ethyl disulphide . By extension, any one of the series of related compounds.

Thibet cloth (a) A fabric made of coarse goat's hair; a kind of camlet. (b) A kind of fine woolen cloth, used for dresses, cloaks, etc.