Webster's Dictionary, 1913

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Thoracometer noun (Physiol.) Same as Stethometer .

Thoracoplasty noun [ Thorax + plasty .] (Medicine) A remodeling or reshaping of the thorax; especially, the operation of removing the ribs, so as to obliterate the pleural cavity in cases of empyema.

Thoracostraca noun plural [ New Latin See Thorax , and Ostracoid , adjective ] (Zoology) An extensive division of Crustacea, having a dorsal shield or carapec... ......niting all, or nearly all, of the thoracic somites to the head. It includes the crabs, lobsters, shrimps, and similar species.

Thoracotomy noun [ Greek ..., ..., thorax + ... to cut.] (Surg.) The operation of opening the pleural cavity by incision.

Thoral adjective [ Latin torus a couch, bed.] Of or pertaining to a bed. [ R.]

Thorax noun [ Latin , from Greek ....]
1. (Anat.) The part of the trunk between the neck and the abdomen, containing that part of the body cavity the walls of which are supported by the dorsal vertebræ, the ribs, and the sternum, and which the heart and lungs are situated; the chest.

» In mammals the thoracic cavity is completely separated from the abdominal by the diaphragm, but in birds and many reptiles the separation is incomplete, while in other reptiles, and in amphibians and fishes, there is no marked separation and no true thorax.

2. (Zoology) (a) The middle region of the body of an insect, or that region which bears the legs and wings. It is composed of three united somites, each of which is composed of several distinct parts. See Illust. in Appendix. and Illust. of Coleoptera . (b) The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix.

3. (Antiq.) A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.

Thoria noun [ New Latin See Thorite .] (Chemistry) A rare white earthy substance, consisting of the oxide of thorium; -- formerly called also thorina .

Thoric adjective (Chemistry) Of or pertaining to thorium; designating the compounds of thorium.

Thorite noun [ So called by Berzelius from the Scandinavian god Thor . See Thor .] (Min.) A mineral of a brown to black color, or, as in the variety orangite , orange-yellow. It is essentially a silicate of thorium.

Thorium noun [ New Latin See Thorite .] (Chemistry) A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum . Symbol Th. Atomic weight 232.0.

Thorn noun [ Anglo-Saxon þorn ; akin to Old Saxon & OFries. thorn , Dutch doorn , German dorn , Danish torn , Swedish törne , Icelandic þorn , Goth. þaúrnus ; confer Pol. tarn , Russian tern' the blackthorn, ternie thorns, Sanskrit trna grass, blade of grass. √53.]
1. A hard and sharp-pointed projection from a woody stem; usually, a branch so transformed; a spine.

2. (Botany) Any shrub or small tree which bears thorns; especially, any species of the genus Cratægus, as the haw thorn , white thorn , cockspur thorn .

3. Fig.: That which pricks or annoys as a thorn; anything troublesome; trouble; care.

There was given to me a thorn in the flesh, the messenger of Satan to buffet me.
2 Cor. xii. 7.

The guilt of empire, all its thorns and cares,
Be only mine.
Southern.

4. The name of the Anglo-Saxon letter ..., capital form .... It was used to represent both of the sounds of English th , as in thin , then . So called because it was the initial letter of thorn , a spine.

Thorn apple (Botany) , Jamestown weed. -- Thorn broom (Botany) , a shrub that produces thorns. -- Thorn hedge , a hedge of thorn-bearing trees or bushes. -- Thorn devil . (Zoology) See Moloch , 2. -- Thorn hopper (Zoology) , a tree hopper ( Thelia cratægi ) which lives on the thorn bush, apple tree, and allied trees.

Thorn transitive verb To prick, as with a thorn. [ Poetic]

I am the only rose of all the stock
That never thorn'd him.
Tennyson.

Thorn-headed adjective Having a head armed with thorns or spines.

Thorn-headed worm (Zoology) , any worm of the order Acanthocephala; -- called also thornhead .

Thornback noun
1. (Zoology) A European skate ( Raia clavata ) having thornlike spines on its back.

2. (Zoology) The large European spider crab or king crab ( Maia squinado ).

Thornbill noun (Zoology) Any one of several species of small, brilliantly colored American birds of the genus Rhamphomicron . They have a long, slender, sharp bill, and feed upon honey, insects, and the juice of the sugar cane.

Thornbird noun (Zoology) A small South American bird ( Anumbius anumbii ) allied to the ovenbirds of the genus Furnarius ). It builds a very large and complex nest of twigs and thorns in a bush or tree.

Thornbut noun [ Thorn + -but as in halibut ; confer German dornbutt .] (Zoology) The turbot.

Thornless adjective Destitute of, or free from, thorns.

Thornset adjective Set with thorns. Dyer.

Thorntail noun (Zoology) A beautiful South American humming bird ( Gouldia Popelairii ), having the six outer tail feathers long, slender, and pointed. The head is ornamented with a long, pointed crest.

Thorny adjective [ Compar. Thornier ; superl. Thorniest .] [ Confer Anglo-Saxon þorniht .]
1. Full of thorns or spines; rough with thorns; spiny; as, a thorny wood; a thorny tree; a thorny crown.

2. Like a thorn or thorns; hence, figuratively, troublesome; vexatious; harassing; perplexing. "The thorny point of bare distress." Shak.

The steep and thorny way to heaven.
Shak.

Thorny rest-harrow (Botany) , rest- harrow. -- Thorny trefoil , a prickly plant of the genus Fagonia ( F. Cretica , etc.).

Thoro adjective Thorough. [ Reformed spelling.]

Thorough preposition [ See Through .] Through. [ Obsolete] Spenser. Shak.

Thorough adjective
1. Passing through; as, thorough lights in a house. [ Obsolete]

2. Passing through or to the end; hence, complete; perfect; as, a thorough reformation; thorough work; a thorough translator; a thorough poet.

Thorough adverb
1. Thoroughly. [ Obsolete or Colloq.] Chaucer.

2. Through. [ Obsolete] Shak.

Thorough noun A furrow between two ridges, to drain off the surface water. [ Prov. Eng.] Halliwell.

Thorough bass (Mus.) The representation of chords by figures placed under the base; figured bass; basso continuo; -- sometimes used as synonymous with harmony .

Thorough-brace noun A leather strap supporting the body of a carriage, and attached to springs, or serving as a spring. See Illust. of Chaise .

Thorough-lighted adjective (Architecture) Provided with thorough lights or windows at opposite sides, as a room or building. Gwilt.

Thoroughbred adjective Bred from the best blood through a long line; pure-blooded; -- said of stock, as horses. Hence, having the characteristics of such breeding; mettlesome; courageous; of elegant form, or the like. -- noun A thoroughbred animal, especially a horse.

Thoroughfare noun [ Anglo-Saxon þurhfaru .]
1. A passage through; a passage from one street or opening to another; an unobstructed way open to the public; a public road; hence, a frequented street.

A large and splendid thoroughfare .
Motley.

2. A passing or going through; passage. [ R.]

[ Made] Hell and this world -- one realm, one continent
Of easy thoroughfare .
Milton.

Thoroughgoing adjective
1. Going through, or to the end or bottom; very thorough; complete.

2. Going all lengths; extreme; thoroughplaced; -- less common in this sense.

Thoroughly adverb In a thorough manner; fully; entirely; completely.

Thoroughness noun The quality or state of being thorough; completeness.

Thoroughpaced adjective Perfect in what is undertaken; complete; going all lengths; as, a thoroughplaced Tory or Whig.

If she be a thoroughplaced impostor.
Sir W. Scott.

Thoroughpin noun (Far.) A disease of the hock (sometimes of the knee) of a horse, caused by inflammation of the synovial membrane and a consequent excessive secretion of the synovial fluid; -- probably so called because there is usually an oval swelling on each side of the leg, appearing somewhat as if a pin had been thrust through.

Thoroughsped adjective Fully accomplished; thoroughplaced. [ R.] Swift.

Thoroughstitch adverb So as to go the whole length of any business; fully; completely. [ Obsolete]

Preservance alone can carry us thoroughstitch .
L'Estrange.

Thoroughwax noun (Botany) (a) An umbelliferous plant ( Bupleurum rotundifolium ) with perfoliate leaves. (b) Thoroughwort.

Thoroughwort noun Same as Boneset .

Thorow preposition Through. [ Obsolete] " Thorow bramble, pits, and floods." Beau. & Fl.

Thorow adjective Thorough. [ Obsolete] Hakluyt.

Thorp, Thorpe (thôrp) noun [ Anglo-Saxon þorp ; akin to Old Saxon & OFries. thorp , Dutch dorp , German dorf , Icelandic þorp , Danish torp , Swedish torp a cottage, a little farm, Goth. þaúrp a field, and probably to Lithuanian troba a building, a house, W. tref a hamlet, Ir. treabh a farmed village, a tribe, clan, Gael. treabhair houses, and perhaps to Latin turba a crowd, mult. Confer Dorp .] A group of houses in the country; a small village; a hamlet; a dorp; -- now chiefly occurring in names of places and persons; as, Al thorp , Mable thorpe . "Within a little thorp I staid." Fairfax.

Then thorpe and byre arose in fire.
Tennyson.

Those pron. [ Middle English þos , þas , Anglo-Saxon ðās , nom. and acc. plural of ðēs this. See This , and confer These .] The plural of that . See That .

Thoth noun
1. (Myth.) The god of eloquence and letters among the ancient Egyptians, and supposed to be the inventor of writing and philosophy. He corresponded to the Mercury of the Romans, and was usually represented as a human figure with the head of an ibis or a lamb.

2. (Zoology) The Egyptian sacred baboon.

Thou pron. [ Sing.: nom. Thou ; poss. Thy or Thine ; obj. Thee . Pl. : nom. You ; poss. Your or Yours ; obj. You .] [ Middle English thou , þu , Anglo-Saxon ðū , ðu ; akin to Old Saxon & OFries. thu , G., Dan. & Swedish du , Icelandic þū , Goth. þu , Russian tui , Ir. & Gael. tu , W. ti , Latin tu , Greek sy` , Dor. ty` , Skr . tvam . √185. Confer Thee , Thine , Te Deum .] The second personal pronoun, in the singular number, denoting the person addressed; thyself; the pronoun which is used in addressing persons in the solemn or poetical style.

Art thou he that should come?
Matt. xi. 3.

» "In Old English, generally, thou is the language of a lord to a servant, of an equal to an equal, and expresses also companionship, love, permission, defiance, scorn, threatening: whilst ye is the language of a servant to a lord, and of compliment, and further expresses honor, submission, or entreaty." Skeat.

» Thou is now sometimes used by the Friends, or Quakers, in familiar discourse, though most of them corruptly say thee instead of thou .

Thou transitive verb To address as thou , esp. to do so in order to treat with insolent familiarity or contempt.

If thou thouest him some thrice, it shall not be amiss.
Shak.

Thou intransitive verb To use the words thou and thee in discourse after the manner of the Friends. [ R.]

Though (&thlig;ō) conj. [ Middle English thogh , þah , Anglo-Saxon ðeáh , ðǣh , ðēh ; akin to Old Saxon thōh , OFries. thach , D. & German doch but, yet, Old High German doh but, yet though, Icelandic þō yet, nevertheless, Swedish dock , Danish dog , Goth. þáuh , þáu , than, or, yet; of uncertain origin. √184.] Granting, admitting, or supposing that; notwithstanding that; if.

Though he slay me, yet will I trust in him.
Job xiii. 15.

Not that I so affirm, though so it seem.
Milton.

» It is compounded with all in although . See Although .

As though , as if.

In the vine were three branches; and it was as though it budded.
Gen. xl. 10.

Though adverb However; nevertheless; notwithstanding; -- used in familiar language, and in the middle or at the end of a sentence.

I would not be as sick though for his place.
Shak.

A good cause would do well, though .
Dryden.