Webster's Dictionary, 1913

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Thalamencephalon noun [ New Latin See Thalamus , and Encephalon .] (Anat.) The segment of the brain next in front of the midbrain, including the thalami, pineal gland, and pituitary body; the diencephalon; the interbrain.

Thalamic adjective (Anat.) Of or pertaining to a thalamus or to thalami.

Thalamifloral, Thalamiflorous adjective [ See Thalamus , and Floral .] (Botany) Bearing the stamens directly on the receptacle; -- said of a subclass of polypetalous dicotyledonous plants in the system of De Candolle.

Thalamocœle noun [ Thalam ic + Greek koi^los hollow.] (Anat.) The cavity or ventricle of the thalamencephalon; the third ventricle.

Thalamophora noun plural [ New Latin , from Greek qa`lamos chamber + ... to bear.] (Zoology) Same as Foraminifera .

Thalamus noun ; plural Thalami . [ Latin thalamus chamber, Greek qa`lamos .]
1. (Anat.) A mass of nervous matter on either side of the third ventricle of the brain; -- called also optic thalamus .

2. (Botany) (a) Same as Thallus . (b) The receptacle of a flower; a torus.

Thalassian noun [ From Greek ... the sea.] (Zoology) Any sea tortoise.

Thalassic adjective [ Greek ... the sea.] (Geol.) Of or pertaining to the sea; -- sometimes applied to rocks formed from sediments deposited upon the sea bottom.

Thalassinian noun (Zoology) Any species of Thalaassinidæ , a family of burrowing macrurous Crustacea, having a long and soft abdomen.

Thalassography noun [ Greek ... sea + -graphy .] The study or science of the life of marine organisms. Agassiz.

Thaler noun [ G. See Dollar .] A German silver coin worth about three shillings sterling, or about 73 cents.

Thalia noun [ Latin , from Greek Qa`leia , originally, blooming, luxuriant, akin to qa`llein to be luxuriant.] (Class. Myth.) (a) That one of the nine Muses who presided over comedy. (b) One of the three Graces. (c) One of the Nereids.

Thaliacea noun plural [ New Latin See Thalia .] (Zoology) A division of Tunicata comprising the free-swimming species, such as Salpa and Doliolum.

Thalian adjective Of or pertaining to Thalia; hence, of or pertaining to comedy; comic.

Thallate noun (Chemistry) A salt of a hypothetical thallic acid.

Thallene noun (Chemistry) A hydrocarbon obtained from coal-tar residues, and remarkable for its intense yellowish green fluorescence.

Thallic adjective (Chemistry) Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a higher valence as contrasted with the thallous compounds; as, thallic oxide.

Thalline adjective (Botany) Consisting of a thallus.

Thalline noun [ Greek ... a young shoot or branch.] (Chemistry) An artificial alkaloid of the quinoline series, obtained as a white crystalline substance, C 10 H 13 NO, whose salts are valuable as antipyretics; - - so called from the green color produced in its solution by certain oxidizing agents.

Thallious adjective (Chemistry) See Thallous .

Thallium noun [ New Latin , from Greek ... young or green shoot or branch, twig. So called from a characteristic bright green line in its spectrum.] (Chemistry) A rare metallic element of the aluminium group found in some minerals, as certain pyrites, and also in the lead-chamber deposit in the manufacture of sulphuric acid. It is isolated as a heavy, soft, bluish white metal, easily oxidized in moist air, but preserved by keeping under water. Symbol Tl. Atomic weight 203.7.

Thallogen noun [ Greek ... young shoot or branch, frond + -gen .] (Botany) One of a large class or division of the vegetable kingdom, which includes those flowerless plants, such as fungi, algæ, and lichens, that consist of a thallus only, composed of cellular tissue, or of a congeries of cells, or even of separate cells, and never show a distinction into root, stem, and leaf.

Thalloid adjective [ Thallus + - oid .] (Botany) Resembling, or consisting of, thallus.

Thallophyta noun plural [ New Latin See Thallophyte .] (Botany) A phylum of plants of very diverse habit and structure, including the algæ, fungi, and lichens. The simpler forms, as many blue-green algæ, yeasts, etc., are unicellular and reproduce vegetatively or by means of asexual spores; in the higher forms the plant body is a thallus , which may be filamentous or may consist of plates of cells; it is commonly undifferentiated into stem, leaves, and roots, and shows no distinct tissue systems; the fronds of many algæ, however, are modified to serve many of the functions of the above- named organs. Both asexual and sexual reproduction, often of a complex type, occur in these forms. The Thallophyta exist almost exclusively as gametophytes, the sporophyte being absent or rudimentary. By those who do not separate the Myxophyta from the Tallophyta as a distinct phylum the latter is treated as the lowermost group in the vegetable kingdom.

Thallophyte noun [ Greek ... young shoot + ... plant.] (Botany) Same as Thallogen .

Thallous adjective (Chemistry) Of or pertaining to thallium; derived from, or containing, thallium; specifically, designating those compounds in which the element has a lower valence as contrasted with the thallic compounds. [ Written also thallious .]

Thallus noun ; plural Thalli . [ New Latin , from Greek ... young shoot or branch, frond.] (Botany) A solid mass of cellular tissue, consisting of one or more layers, usually in the form of a flat stratum or expansion, but sometimes erect or pendulous, and elongated and branching, and forming the substance of the thallogens.

Thalweg noun [ G., from thal valley + weg way. See Dale ; Way .] (Physiography) (a) A line following the lowest part of a valley, whether under water or not. (b) The line of continuous maximum descent from any point on a land surface, or that cutting all contours and angles.

Thammuz, Tammuz noun [ Hebrew thammūz .]
1. A deity among the ancient Syrians, in honor of whom the Hebrew idolatresses held an annual lamentation. This deity has been conjectured to be the same with the Phœnician Adon, or Adonis. Milton.

2. The fourth month of the Jewish ecclesiastical year, -- supposed to correspond nearly with our month of July.

Thamnophile noun [ Greek qa`mnos a bush + fi`los loving.] (Zoology) A bush shrike.

Thamyn noun (Zoology) An Asiatic deer ( Rucervus Eldi ) resembling the swamp deer; -- called also Eld's deer .

Than (&thlig;ăn) conj. [ Middle English than , thon , then , thanne , thonne , thenne , than, then, Anglo-Saxon ðanne , ðonne , ðænne ; akin to Dutch dan , Old High German danne , German dann then, denn than, for, Goth. þan then, and to English the , there , that . See That , and confer Then .] A particle expressing comparison, used after certain adjectives and adverbs which express comparison or diversity, as more , better , other , otherwise , and the like. It is usually followed by the object compared in the nominative case. Sometimes, however, the object compared is placed in the objective case, and than is then considered by some grammarians as a preposition. Sometimes the object is expressed in a sentence, usually introduced by that ; as, I would rather suffer than that you should want.

Behold, a greater than Solomon is here.
Matt. xii. 42.

Which when Beelzebub perceived, than whom,
Satan except, none higher sat.

It's wiser being good than bad;
It's safer being meek than fierce;
It's fitter being sane than mad.
R. Browning.

Than adverb Then. See Then . [ Obsolete] Gower.

Thanne longen folk to gon on pilgrimages.

Thana (tä"nä) noun [ Written also tana , tanna .] [ Hind. thānā .] A police station. [ India] Kipling.

Thanage noun The district in which a thane anciently had jurisdiction; thanedom.

Thanatoid adjective [ Greek qa`natos death + -oid .] Deathlike; resembling death. Dunglison.

Thanatology noun [ Greek qa`natos + -logy .] A description, or the doctrine, of death. Dunglison.

Thanatopsis noun [ New Latin , from Greek qa`natos death + 'o`psis view.] A view of death; a meditation on the subject of death. Bryant.

Thane (thān) noun [ Middle English thein , þein , Anglo-Saxon þegen , þegn ; akin to Old High German degan a follower, warrior, boy, Middle High German degen a hero, German degen hero, soldier, Icelandic þegn a thane, a freeman; probably akin to Greek te`knon a child, ti`ktein to bear, beget, or perhaps to Goth. þius servant, Anglo-Saxon þeów , German dienen to serve.] A dignitary under the Anglo-Saxons and Danes in England. Of these there were two orders, the king's thanes, who attended the kings in their courts and held lands immediately of them, and the ordinary thanes, who were lords of manors and who had particular jurisdiction within their limits. After the Conquest, this title was disused, and baron took its place.

» Among the ancient Scots, thane was a title of honor, which seems gradually to have declined in its significance. Jamieson.

Thanedom noun The property or jurisdiction of a thane; thanage. Sir W. Scott.

Thanehood noun The character or dignity of a thane; also, thanes, collectively. J. R. Green.

Thaneship noun The state or dignity of a thane; thanehood; also, the seignioralty of a thane.

Thank (thă&nsmac;k) noun ; plural Thanks . [ Anglo-Saxon þanc , þonc , thanks, favor, thought; akin to Old Saxon thank favor, pleasure, thanks, D. & German dank thanks, Icelandic þökk , Danish tak , Swedish tack , Goth. þagks thanks; -- originally, a thought, a thinking. See Think .] A expression of gratitude; an acknowledgment expressive of a sense of favor or kindness received; obligation, claim, or desert, or gratitude; -- now generally used in the plural. "This ceremonial thanks ." Massinger.

If ye do good to them which do good to you, what thank have ye? for sinners also do even the same.
Luke vi. 33.

What great thank , then, if any man, reputed wise and constant, will neither do, nor permit others under his charge to do, that which he approves not, especially in matter of sin?

Thanks , thanks to thee, most worthy friend,
For the lesson thou hast taught.

His thanks , Her thanks , etc., of his or her own accord; with his or her good will; voluntary. [ Obsolete]

Full sooth is said that love ne lordship,
Will not, his thanks , have no fellowship.

-- In thank , with thanks or thankfulness. [ Obsolete] -- Thank offering , an offering made as an expression of thanks.

Thank transitive verb [ imperfect & past participle Thanked ; present participle & verbal noun Thanking .] [ Anglo-Saxon þancian . See Thank , noun ] To express gratitude to (anyone) for a favor; to make acknowledgments to (anyone) for kindness bestowed; -- used also ironically for blame .

"Graunt mercy, lord, that thank I you," quod she.

I thank thee for thine honest care.

Weigh the danger with the doubtful bliss,
And thank yourself if aught should fall amiss.

Thankful adjective [ Anglo-Saxon þancfull .]
1. Obtaining or deserving thanks; thankworthy. [ R.]

Ladies, look here; this is the thankful glass
That mends the looker's eyes; this is the well
That washes what it shows.

2. Impressed with a sense of kindness received, and ready to acknowledge it; grateful.

Be thankful unto him, and bless his name.
Ps. c. 4.

-- Thank"ful*ly , adverb -- Thank"ful*ness , noun

Thankless adjective
1. Not acknowledging favors; not expressing thankfulness; unthankful; ungrateful.

That she may feel
How sharper than a serpent's tooth it is
To have a thankless child!

2. Not obtaining or deserving thanks; unacceptable; as, a thankless task.

To shepherd thankless , but by thieves that love the night allowed.

-- Thank"less*ly adverb -- Thank"less*ness , noun

Thankly adverb Thankfully. [ Obsolete] Sylvester (Du Bartas).

Thanksgive transitive verb To give or dedicate in token of thanks. [ Obsolete or R.] Mede.

Thanksgiver noun One who gives thanks, or acknowledges a kindness. Barrow.