Thermotaxis Ther`mo·tax"is 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 Ther`mo·ten"sile adjective Pertaining to the variation of tensile strength with the temperature.

Thermotension Ther`mo·ten"sion 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 Ther`mo·ther"a·py noun [ Thermo- + therapy .] (Medicine) Treatment of disease by heat, esp. by hot air.

Thermotic, Thermotical Ther·mot"ic, Ther·mot"ic·al adjective [ Greek ... heat, from ... hot.] Of or pertaining to heat; produced by heat; as, thermotical phenomena. Whewell.

Thermotics Ther·mot"ics noun The science of heat. Whewell.

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

Thermotropic Ther`mo·trop"ic adjective (Botany) Manifesting thermotropism.

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

Thermotype Ther"mo·type 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 Ther·mot"y·py noun The art or process of obtaining thermotypes.

Thermovoltaic Ther`mo·vol·ta"ic adjective [ Thermo- + voltaic .] (Physics) Of or relating to heat and electricity; especially, relating to thermal effects produced by voltaic action. Faraday.

Thermæ Ther"mæ noun plural [ Latin See Thermal .] Springs or baths of warm or hot water.

Theroid The"roid 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 The`ro·mor"pha noun plural [ New Latin : Greek ... beast + ... form.] (Paleon.) See Theriodonta .

Theropoda The·rop"o·da 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 The·sau"rus 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 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 Thes"i·cle noun [ Dim. of thesis .] A little or subordinate thesis; a proposition.

Thesis The"sis 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.

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.

Thesmothete Thes"mo·thete 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 Thes"pi·an 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 Thes·sa"li·an adjective [ Confer Latin Thessalius .] Of or pertaining to Thessaly in Greece. Shak. -- noun A native or inhabitant of Thessaly.

Thessalonian Thes`sa·lo"ni·an adjective Of or pertaining to Thessalonica, a city of Macedonia. -- noun A native or inhabitant of Thessalonica.

Theta The"ta 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 Thet"ic·al adjective [ Greek ... fit for placing, from ... to set, lay down. See Thesis .] Laid down; absolute or positive, as a law. Dr. H. More.

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

Theurgic, Theurgical The·ur"gic, The·ur"gic·al adjective [ Latin theurgicus , Greek ...: confer French théurgique .] Of or pertaining to theurgy; magical.

Theurgic hymns , songs of incantation.

Theurgist The"ur·gist noun [ Confer French théurgiste .] One who pretends to, or is addicted to, theurgy. Hallywell.

Theurgy The"ur·gy (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 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.

Chaucer.

Evil speeches destroy good thews .

Wyclif (1 Cor. xv. 33).

To be upbrought in gentle thews and martial might.

Spenser.

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.

Tennyson.

Thewed 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.

Spenser.

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

They They (&thlig;ā) pron. plural ; poss. Theirs ; obj. Them . [ Icelandic þeir they, properly nom. plural masc. of sā , sū , þat , a demonstrative pronoun, akin to the English definite article, Anglo-Saxon sē , 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.

Chaucer.

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

Thialol Thi"al·ol 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 Thib"et 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.

Thibetan Thib"e·tan adjective Of or pertaining to Thibet. -- noun A native or inhabitant of Thibet.

Thibetian Thi·be"tian adjective & noun Same as Thibetan .

Thible Thi"ble noun A slice; a skimmer; a spatula; a pudding stick. [ Obsolete or Prov. Eng.] Ainsworth.

Thick Thick (thĭk) adjective [ Compar. Thicker (-ẽr); superl. Thickest .] [ Middle English thicke , Anglo-Saxon þicce ; akin to Dutch dik , Old Saxon thikki , Old High German dicchi thick, dense, German dick thick, Icelandic þykkr , þjökkr , and probably to Gael. & Ir. tiugh . Confer Tight .] 1. Measuring in the third dimension other than length and breadth, or in general dimension other than length; - - said of a solid body; as, a timber seven inches thick .

Were it as thick as is a branched oak.

Chaucer.

My little finger shall be thicker than my father's loins.

1 Kings xii. 10.

2. Having more depth or extent from one surface to its opposite than usual; not thin or slender; as, a thick plank; thick cloth; thick paper; thick neck.

3. Dense; not thin; inspissated; as, thick vapors. Also used figuratively; as, thick darkness.

Make the gruel thick and slab.

Shak.

4. Not transparent or clear; hence, turbid, muddy, or misty; as, the water of a river is apt to be thick after a rain. "In a thick , misty day." Sir W. Scott.

5. Abundant, close, or crowded in space; closely set; following in quick succession; frequently recurring.

The people were gathered thick together.

Luke xi. 29.

Black was the forest; thick with beech it stood.

Dryden.

6. Not having due distinction of syllables, or good articulation; indistinct; as, a thick utterance.

7. Deep; profound; as, thick sleep. [ R.] Shak.

8. Dull; not quick; as, thick of fearing. Shak.

His dimensions to any thick sight were invincible.

Shak.

9. Intimate; very friendly; familiar. [ Colloq.]

We have been thick ever since.

T. Hughes.

» Thick is often used in the formation of compounds, most of which are self-explaining; as, thick -barred, thick -bodied, thick -coming, thick -cut, thick -flying, thick - growing, thick -leaved, thick -lipped, thick -necked, thick -planted, thick -ribbed, thick -shelled, thick -woven, and the like.

Thick register . (Phon.) See the Note under Register , noun , 7. -- Thick stuff (Nautical) , all plank that is more than four inches thick and less than twelve. J. Knowles.

Syn. -- Dense; close; compact; solid; gross; coarse.

Thick Thick noun 1. The thickest part, or the time when anything is thickest.

In the thick of the dust and smoke.

Knolles.

2. A thicket; as, gloomy thicks . [ Obsolete] Drayton.

Through the thick they heard one rudely rush.

Spenser.

He through a little window cast his sight
Through thick of bars, that gave a scanty light.

Dryden.

Thick-and-thin block (Nautical) , a fiddle block. See under Fiddle . -- Through thick and thin , through all obstacles and difficulties, both great and small.

Through thick and thin she followed him.

Hudibras.

He became the panegyrist, through thick and thin , of a military frenzy.

Coleridge.

Thick Thick (thĭk) adverb [ Anglo-Saxon þicce .] 1. Frequently; fast; quick.

2. Closely; as, a plat of ground thick sown.

3. To a great depth, or to a greater depth than usual; as, land covered thick with manure.

Thick and threefold , in quick succession, or in great numbers. [ Obsolete] L'Estrange.

Thick Thick transitive verb & i. [ Confer Anglo-Saxon þiccian .] To thicken. [ R.]

The nightmare Life-in-death was she,
Who thicks man's blood with cold.

Coleridge.

Thick wind Thick" wind` (Far.) A defect of respiration in a horse, that is unassociated with noise in breathing or with the signs of emphysema.

Thick-headed Thick"-head`ed adjective Having a thick skull; stupid.

Thick-knee Thick"-knee` noun (Zoology) A stone curlew. See under Stone .

Thick-skinned Thick"-skinned` adjective Having a thick skin; hence, not sensitive; dull; obtuse. Holland.

Thick-skulled Thick"-skulled` adjective Having a thick skull; hence, dull; heavy; stupid; slow to learn.

Thick-winded Thick"-wind`ed adjective (Far.) Affected with thick wind.

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