Webster's Dictionary, 1913

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Theorize intransitive verb [ imperfect & past participle Theorized ; present participle & verbal noun Theorizing .] [ Confer French théoriser .] To form a theory or theories; to form opinions solely by theory; to speculate.

Theorizer noun One who theorizes or speculates; a theorist.

Theory noun ; plural Theories . [ French théorie , Latin theoria , Greek ... a beholding, spectacle, contemplation, speculation, from ... a spectator, ... to see, view. See Theater .]
1. A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.

» "This word is employed by English writers in a very loose and improper sense. It is with them usually convertible into hypothesis , and hypothesis is commonly used as another term for conjecture . The terms theory and theoretical are properly used in opposition to the terms practice and practical . In this sense, they were exclusively employed by the ancients; and in this sense, they are almost exclusively employed by the Continental philosophers." Sir W. Hamilton.

2. An exposition of the general or abstract principles of any science; as, the theory of music.

3. The science, as distinguished from the art; as, the theory and practice of medicine.

4. The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.

Atomic theory , Binary theory , etc. See under Atomic , Binary , etc.

Syn. -- Hypothesis, speculation. -- Theory , Hypothesis . A theory is a scheme of the relations subsisting between the parts of a systematic whole; an hypothesis is a tentative conjecture respecting a cause of phenomena.

Theosoph, Theosopher noun A theosophist.

Theosophic, Theosophical adjective [ Confer French théosophique .] Of or pertaining to theosophy. -- The`o*soph"ic*al*ly , adverb

Theosophism noun [ Confer French théosophisme .] Belief in theosophy. Murdock.

Theosophist noun One addicted to theosophy.

The theosophist is one who gives you a theory of God, or of the works of God, which has not reason, but an inspiration of his own, for its basis.
R. A. Vaughan.

Theosophistical adjective Of or pertaining to theosophy; theosophical.

Theosophize intransitive verb [ imperfect & past participle Theosophized ; present participle & verbal noun Theosophizing .] To practice theosophy. [ R.]

Theosophy noun [ Greek ... knowledge of things divine, from ... wise in the things of God; ... God + ... wise: confer French théosophie .] Any system of philosophy or mysticism which proposes to attain intercourse with God and superior spirits, and consequent superhuman knowledge, by physical processes, as by the theurgic operations of some ancient Platonists, or by the chemical processes of the German fire philosophers; also, a direct, as distinguished from a revealed, knowledge of God, supposed to be attained by extraordinary illumination; especially, a direct insight into the processes of the divine mind, and the interior relations of the divine nature.

Therapeutic noun One of the Therapeutæ.

Therapeutic, Therapeutical adjective [ French thérapeutique , Greek ..., from ... attendant, servant, ... to serve, take care of, treat medically, ... attendant, servant.] (Medicine) Of or pertaining to the healing art; concerned in discovering and applying remedies for diseases; curative. " Therapeutic or curative physic." Sir T. Browne.

Medicine is justly distributed into "prophylactic," or the art of preserving health, and therapeutic , or the art of restoring it.
I. Watts.

Therapeutics noun [ Confer French thérapeutique .] That part of medical science which treats of the discovery and application of remedies for diseases.

Therapeutist noun One versed in therapeutics, or the discovery and application of remedies.

Therapeutæ noun plural [ New Latin , from Greek ... (pl. ...) an attendant, servant, physician. See Therapeutic .] (Eccl. Hist.) A name given to certain ascetics said to have anciently dwelt in the neighborhood of Alexandria. They are described in a work attributed to Philo, the genuineness and credibility of which are now much discredited.

Therapy noun [ Greek ....] Therapeutics.

There adverb [ Middle English ther , Anglo-Saxon ðǣr ; akin to Dutch daar , German da , Old High German dār , Swedish & Danish der , Icelandic & Goth. þar , Sanskrit tarhi then, and English that . √184. See That , pron. ]
1. In or at that place. "[ They] there left me and my man, both bound together." Shak.

The Lord God planted a garden eastward in Eden; and there he put the man whom he had formed.
Ge. ii. 8.

» In distinction from here , there usually signifies a place farther off. "Darkness there might well seem twilight here ." Milton.

2. In that matter, relation, etc.; at that point, stage, etc., regarded as a distinct place; as, he did not stop there , but continued his speech.

The law that theaten'd death becomes thy friend
And turns it to exile; there art thou happy.
Shak.

3. To or into that place; thither.

The rarest that e'er came there .
Shak.

» There is sometimes used by way of exclamation, calling the attention to something, especially to something distant; as, there , there ! see there ! look there ! There is often used as an expletive, and in this use, when it introduces a sentence or clause, the verb precedes its subject.

A knight there was, and that a worthy man.
Chaucer.

There is a path which no fowl knoweth.
Job xxviii. 7.

Wherever there is a sense or perception, there some idea is actually produced.
Locke.

There have been that have delivered themselves from their ills by their good fortune or virtue.
Suckling.

» There is much used in composition, and often has the sense of a pronoun. See Thereabout , Thereafter , Therefrom , etc.

» There was formerly used in the sense of where .

Spend their good there it is reasonable.
Chaucer.

Here and there , in one place and another.

Syn. -- See Thither .

There-anent adverb Concerning that. [ Scot.]

Thereabout, Thereabouts adverb [ The latter spelling is less proper, but more commonly used.]
1. Near that place.

2. Near that number, degree, or quantity; nearly; as, ten men, or thereabouts .

Five or six thousand horse . . . or thereabouts .
Shak.

Some three months since, or thereabout .
Suckling.

3. Concerning that; about that. [ R.]

What will ye dine? I will go thereabout .
Chaucer.

They were much perplexed thereabout .
Luke xxiv. 4.

Thereafter adverb [ Anglo-Saxon ðǣræfter after that. See There , and After .]
1. After that; afterward.

2. According to that; accordingly.

I deny not but that it is of greatest concernment in the church and commonwealth to have a vigilant eye how books demean themselves as well as men; and thereafter to confine, imprison, and do sharpest justice on them as malefactors.
Milton.

3. Of that sort. [ Obsolete] "My audience is not thereafter ." Latimer.

Thereagain adverb In opposition; against one's course. [ Obsolete]

If that him list to stand thereagain .
Chaucer.

Thereat adverb
1. At that place; there.

Wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat .
Matt. vii. 13.

2. At that occurrence or event; on that account.

Every error is a stain to the beauty of nature; for which cause it blusheth thereat .
Hooker.

Therebefore, Therebiforn adverb Before that time; beforehand. [ Obsolete]

Many a winter therebiforn .
Chaucer.

Thereby adverb
1. By that; by that means; in consequence of that.

Acquaint now thyself with him, and be at peace; thereby good shall come unto thee.
Job xxii. 21.

2. Annexed to that. " Thereby hangs a tale." Shak.

3. Thereabout; -- said of place, number, etc. Chaucer.

Therefor adverb [ There + for. Confer Therefore .] For that, or this; for it.

With certain officers ordained therefore .
Chaucer.

Therefore conj. & adverb [ Middle English therfore . See There , and Fore , adverb , For , and confer Therefor .]
1. For that or this reason, referring to something previously stated; for that.

I have married a wife, and therefore I can not come.
Luke xiv. 20.

Behold, we have forsaken all, and followed thee; what shall we have therefore ?
Matt. xix. 27.

2. Consequently; by consequence.

He blushes; therefore he is guilty.
Spectator.

Syn. -- See Then .

Therefrom adverb From this or that.

Turn not aside therefrom to the right hand or to the left.
John. xxiii. 6.

Therein adverb In that or this place, time, or thing; in that particular or respect. Wyclif.

He pricketh through a fair forest,
Therein is many a wild beast.
Chaucer.

Bring forth abundantly in the earth, and multiply therein .
Gen. ix. 7.

Therein our letters do not well agree.
Shak.

Thereinto adverb Into that or this, or into that place. Bacon.

Let not them . . . enter thereinto .
Luke xxi. 21.

Thereof adverb Of that or this.

In the day that thou eatest thereof , thou shalt surely die.
Gen. ii. 17.

Thereology noun Therapeutios.

Thereon adverb [ Anglo-Saxon ......ron . See There , and On .] On that or this. Chaucer.

Then the king said, Hang him thereon .
Esther vii. 9.

Thereout adverb
1. Out of that or this.

He shall take thereout his handful of the flour.
Lev. ii. 2.

2. On the outside; out of doors. [ Obsolete] Chaucer.

Thereto adverb
1. To that or this. Chaucer.

2. Besides; moreover. [ Obsolete] Spenser.

Her mouth full small, and thereto soft and red.
Chaucer.

Theretofore adverb Up to that time; before then; -- correlative with heretofore .

Thereunder adverb Under that or this.

Thereunto adverb Unto that or this; thereto; besides. Shak.

Thereupon adverb
1. Upon that or this; thereon. "They shall feed thereupon ." Zeph. ii. 7.

2. On account, or in consequence, of that; therefore.

[ He] hopes to find you forward, . . .
And thereupon he sends you this good news.
Shak.

3. Immediately; at once; without delay.

Therewhile adverb At that time; at the same time. [ Obsolete] Laud.

Therewith adverb
1. With that or this. "I have learned in whatsoever state I am, therewith to be content." Phil. iv. 11.

2. In addition; besides; moreover.

To speak of strength and therewith hardiness.
Chaucer.

3. At the same time; forthwith. [ Obsolete] Johnson.

Therewithal adverb
1. Over and above; besides; moreover. [ Obsolete] Daniel.

And therewithal it was full poor and bad.
Chaucer.

2. With that or this; therewith; at the same time.

Thy slanders I forgive; and therewithal
Remit thy other forfeits.
Shak.

And therewithal one came and seized on her,
And Enid started waking.
Tennyson.

Therf adjective [ Anglo-Saxon ...eorf ; akin to Old High German derb , Icelandic ...jarfr .] Not fermented; unleavened; - - said of bread, loaves, etc. [ Obsolete]

Pask and the feast of therf loaves.
Wyclif.

Theriac The*ri"a*ca noun [ Latin theriaca an antidote against the bite of serpents, Greek ...: confer French thériaque . See Treacle .]
1. (Old Med.) An ancient composition esteemed efficacious against the effects of poison; especially, a certain compound of sixty-four drugs, prepared, pulverized, and reduced by means of honey to an electuary; -- called also theriaca Andromachi , and Venice treacle .

2. Treacle; molasses. British Pharm.

The"ri*ac The*ri"a*cal
Therial adjective Theriac. [ R.] Holland.

Theriodont noun (Paleon.) One of the Theriodontia. Used also adjectively.

Theriodonta noun plural [ New Latin ] (Paleon.) Same as Theriodontia .

Theriodontia noun plural [ New Latin , from Greek ... (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 .

Theriotomy noun [ Greek ... wild beast + ... to cut.] Zoötomy.

Thermal adjective [ Latin thermae hot springs, from Greek ..., plural of ... heat, from ... hot, warm, ... to warm, make hot; perhaps akin to Latin formus warm, and English 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 .

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