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white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as an indicator.

naturally dissolved in crude petroleum, and also made artificially; -- called also propyl hydride.

A radical of which quinone is the hydride, analogous to phenyl. [Written also kinoyl.]

rtifically from silicon, and analogous to methane; -- called also silico-methane, silicon hydride, and formerly siliciureted hydrogen.

Antimony hydride, or hydrogen antimonide, a colorless gas produced by the action of nascent hydrogen on antimony. It has a characteristic odor and burns with a characteristic greenish flame. Formerly called also antimoniureted hydrogen.

A white crystalline nitrogenous substance, C2H4.(CO)2.NH, obtained by treating succinic anhydride with ammonia gas. It is a typical imido acid, and forms a series of salts. See Imido acid, under Imido.

acid, which is obtained as a white crystalline substance by heating urea with succinic anhydride. It is known also in its salts.

production of sulphuric acid, and as a reagent in bleaching; -- called also sulphurous anhydride, and formerly sulphurous acid. -- Sulphur ether (Chem.), a sulphide of hydrocarbon radicals, formed like the ordinary ethers, which are oxides, but with sulphur in the place of oxygen. -- Sulphur salt (Chem.), a salt of…

d, or Nordhausen sulphuric acid. See Disulphuric acid, under Disulphuric. -- Sulphuric anhydride, sulphur trioxide. See under Sulphur. -- Sulphuric ether, common anæsthetic ether; -- so called because made by the catalytic action of sulphuric acid on alcohol. See Ether, 3 (a).

xide in water, but forming a well-known series of salts (the sulphites). -- Sulphurous anhydride (Chem.), sulphur dioxide. See under Sulphur.

composes into sulphuric and hydrochloric acids, and is hence called also sulphuric chloranhydride.

compound obtained as a yellowish gray powder by the action of acetyl chloride or acetic anhydride or ordinary tannic acid. It is used as an intestinal astringent, and locally in rhinitis and pharyngitis.

Of, pertaining to, or designating, an anhydride, C4H4O5, of tartaric acid, obtained as a white crystalline deliquescent substance.

products, as valeric acid; as in valerolactone, a colorless oily liquid produced as the anhydride of an hydroxy valeric acid.

n oily substance having a bittersweet taste; -- so called from its tendency to form its anhydride.