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The hypothetical radical SO, regarded as an essential constituent of certain sulphurous compounds; as, thionyl chloride.

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.

Of, pertaining to, or derived from, thiophene; specifically, designating a certain acid analogous to benzoic acid.

A colorless mobile liquid, C6H5.SH, of an offensive odor, and analogous to phenol; -- called also phenyl sulphydrate.

A double thiophene nucleus, C6H4S2, analogous to thionaphthene, and the base of a large series of compounds. [Written also thiophtene.]

A salt of thiosulphuric acid; -- formerly called hyposulphite.

Of, pertaining to, or designating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.

colorless oily liquid, C4H3S.CH3, analogous to, and resembling, toluene; -- called also methyl thiophene.

Any one of three possible metameric substances, which are dimethyl derivatives of thiophene, like the xylenes from benzene.

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

The third rail used in the third-rail system.

An under constable. Shak. Johnson.

A third part of the profits of fines and penalties imposed at the country court, which was among the perquisites enjoyed by the earl.

A system in which a third rail is used for carrying the current for operating the motors, the rail being insulated from the ground and the current being taken off by means of contact brushes or other devices.

The third part of the corn or grain growing on the ground at the tenant's death, due to the lord for a heriot, as within the manor of Turfat in Herefordshire.

In the third place. Bacon.

To bore; to drill or thrill. See Thrill. [Obs. or Prov.] That with a spear was thirled his breast bone. Chaucer.

The right which the owner of a mill possesses, by contract or law, to compel the tenants of a certain district, or of his sucken, to bring all their grain to his mill for grinding. Erskine.

A sensation of dryness in the throat associated with a craving for liquids, produced by deprivation of drink, or by some other cause (as fear, excitement, etc.) which arrests the secretion of the pharyngeal mucous membrane; hence, the condition producing this sensation. Wherefore is this that thou hast brought us up ou…

One who thirsts.