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trasted with the sulphurous compounds; as, sulphuric acid. Sulphuric acid. (a) Sulphur trioxide (see under Sulphur); -- formerly so called on the dualistic theory of salts. [Obs.] (b) A heavy, corrosive, oily liquid, H2SO4, colorless when pure, but usually yellowish or brownish, produced by the combined action of sulph…

Having the characteristic odor of sulphur dioxide, or of hydrogen sulphide, or of other sulphur compounds. Sulphurous acid. (a) Sulphur dioxide. See under Sulphur. [Obs.] (b) An acid, H2SO3, not known in the free state except as a solution of sulphur dioxide in water, but forming a well-known series of salts (the sulph…

fuming liquid, SO2.Cl2, obtained by the action of phosphorus pentachloride on sulphur trioxide. On treatment with water it decomposes into sulphuric and hydrochloric acids, and is hence called also sulphuric chloranhydride.

as in calcium superphosphate. It has been superseded by per-, bi-, di-, acid, etc. (as peroxide, bicarbonate, disulphide, and acid sulphate), which retain the old meanings of super-, but with sharper definition. Cf. Acid, a., Bi-, Di-, and Per-.

To combine with oxygen so as to form a suroxide or peroxide. [Obs.]

Oxide of tellurium. It occurs sparingly in tufts of white or yellowish crystals.

are regarded as having different functions or relations in the molecule; thus, sodic hydroxide, NaOH, is a ternary compound.

ance or ingredient denoted by the term to which it is prefixed, as in tetra-chloride, tetroxide.

h the element has a higher valence as contrasted with the thallous compounds; as, thallic oxide.

A rare white earthy substance, consisting of the oxide of thorium; -- formerly called also thorina.

Oxide of thulium.

An elementary substance found as an oxide in the mineral cassiterite, and reduced as a soft white crystalline metal, malleable at ordinary temperatures, but brittle when heated. It is not easily oxidized in the air, and is used chiefly to coat iron to protect it from rusting, in the form of tin foil with mercury to for…

t, or the third degree of that to the name of which it is prefixed; as in trisulphide, trioxide, trichloride.

ty of crystallizing in three forms fundamentally distinct, as is the case with titanium dioxide, which crystallizes in the forms of rutile, octahedrite, and brookite. See Pleomorphism.

or pertaining to tungsten; derived from, or resembling, tungsten; wolframic; as, tungstic oxide. Tungstic acid, an acid of tungsten, H2WO4, analogous to sulphuric and chromic acids.

The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.

imation product in the flues of smelting furnaces of zinc, and consisting of a crude zinc oxide.

n both oil and water colors, obtained from certain natural clays variously colored by the oxides of iron and manganese. It is commonly heated or burned before being used, and is then called burnt umber; when not heated, it is called raw umber. See Burnt umber, below.

A yellow, earthy incrustation, consisting essentially of the oxide of uranium, but more or less impure.

A mineral consisting chiefly of uranium oxide with some lead, thorium, etc., occurring in black octahedrons, also in masses with a pitchlike luster; pitchblende.