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slice of wood) obtained by first wetting the object slightly with hydrochloric or dilute sulphuric acid, then taking an impression with a press, and next strongly heating this impression.

Any one of a series of complex basic sulphur compounds analogous to the sulphines.

A weak nitrogenous sulphur base, C6H13NS2.

A combining form (also used adjectively) denoting the presence of sulphur. See Sulpho-.

Of or pertaining to sulphur; containing or resembling sulphur; specifically, designating certain of the thio compounds; as, the thionic acids. Cf. Dithionic, Trithionic, Tetrathionic, etc.

An artificial red or violet dyestuff consisting of a complex sulphur derivative of certain aromatic diamines, and obtained as a dark crystalline powder; -- called also phenylene violet.

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.

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

A species of gause, or very silk. The smoke of sulphur . . . is commonly used by women to whiten tiffanies. Sir T. Browne.

evation. [Obs.] Johnson. Gay Lussac's tower (Chem.), a large tower or chamber used in the sulphuric acid process, to absorb (by means of concentrated acid) the spent nitrous fumes that they may be returned to the Glover's tower to be reemployed. See Sulphuric acid, under Sulphuric, and Glover's tower, below. -- Glover…

To subject to some action; to apply something to; as, to treat a substance with sulphuric acid. Ure.

An oxide containing three atoms of oxygen; as, sulphur trioxide, SO3; -- formerly called tritoxide.

A sulphide containing three atoms of sulphur.

n; wolframic; as, tungstic oxide. Tungstic acid, an acid of tungsten, H2WO4, analogous to sulphuric and chromic acids.

brittle mineral of a steel-gray color and metallic luster, containing antimony, arsenic, sulphur, and nickel.

azuli, but now produced in large quantities by fusing together silica, alumina, soda, and sulphur, thus forming a glass, colored blue by the sodium polysulphides made in the fusion. Also used adjectively. Green ultramarine, a green pigment obtained as a first product in the manufacture of ultramarine, into which it is…

a knot. Sacharissa's captive fain Would untie his iron chain. Waller. Her snakes untied, sulphurous waters drink. Pope.

The operation of expelling one substance from another by heat, as sulphur or arsenic from ores, in a muffle.

e or minute; -- said especially with reference to the condition of certain substances, as sulphur, selenium, etc., when condensed from the vaporous state and deposited upon cold bodies, in which case they assume the form of small globules filled with liquid.