Third estate. (a) In England, the commons, or the commonalty, who are represented in Parliament by the House of Commons. (b) In France, the tiers état. See Tiers état. Third order(R. C. Ch.), an order attached to a monastic order, and comprising men and women devoted to a rule of pious living, called the third rule, by a simple vow if they remain seculars, and by more solemn vows if they become regulars. See Tertiary, n., 1.Third person(Gram.), the person spoken of. See Person, n., 7.Third sound. (Mus.) See Third, n., 3.

(Third) n.

1. The quotient of a unit divided by three; one of three equal parts into which anything is divided.

2. The sixtieth part of a second of time.

3. (Mus.) The third tone of the scale; the mediant.

4. pl. (Law) The third part of the estate of a deceased husband, which, by some local laws, the widow is entitled to enjoy during her life.

Major third(Mus.), an interval of two tones.Minor third(Mus.), an interval of a tone and a half.

(Thi"o*phene) n. [Thio- + phenyl + -ene.] (Chem.) A sulphur hydrocarbon, C4H4S, analogous to furfuran and benzene, and acting as the base of a large number of substances which closely resemble the corresponding aromatic derivatives.

(Thi`o*phen"ic) a. (Chem.) Of, pertaining to, or derived from, thiophene; specifically, designating a certain acid analogous to benzoic acid.

(Thi`o*phe"nol) n. [Thio- + phenol.] (Chem.) A colorless mobile liquid, C6H5.SH, of an offensive odor, and analogous to phenol; — called also phenyl sulphydrate.

(Thi*oph"thene) n. [Abbreviated from thionaphthene.] (Chem.) A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [Written also thiophtene.]

(Thi`o*sul"phate) n. (Chem.) A salt of thiosulphuric acid; — formerly called hyposulphite.

The sodium salt called in photography by the name sodium hyposulphite, being used as a solvent for the excess of unchanged silver chloride, bromide, and iodide on the sensitive plate.

(Thi`o*sul*phur"ic) a. [Thio- + sulphuric.] (Chem.) Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.

(Thi`o*to"lene) n. [Thio- + toluene.] (Chem.) A colorless oily liquid, C4H3S.CH3, analogous to, and resembling, toluene; — called also methyl thiophene.

(Thi*ox"ene) n. [Thiophene + xylene.] (Chem.) Any one of three possible metameric substances, which are dimethyl derivatives of thiophene, like the xylenes from benzene.

(Third) a. [OE. thirde, AS. þridda, fr. þri, þreó, three; akin to D. derde third, G. dritte, Icel. þriði, Goth. þridja, L. tertius, Gr. tri`tos, Skr. t&rsdottiya. See Three, and cf. Riding a jurisdiction, Tierce.]

1. Next after the second; coming after two others; — the ordinal of three; as, the third hour in the day. "The third night." Chaucer.

2. Constituting or being one of three equal parts into which anything is divided; as, the third part of a day.

  By PanEris using Melati.

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