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3 definitions found
 for Sulphuric acid
From The Collaborative International Dictionary of English v.0.48 :

  Sulphur \Sul"phur\, n. [L., better sulfur: cf. F. soufre.]
     1. (Chem.) A nonmetallic element occurring naturally in large
        quantities, either combined as in the sulphides (as
        pyrites) and sulphates (as gypsum), or native in volcanic
        regions, in vast beds mixed with gypsum and various earthy
        materials, from which it is melted out. Symbol S. Atomic
        weight 32. The specific gravity of ordinary octohedral
        sulphur is 2.05; of prismatic sulphur, 1.96.
        [1913 Webster]
     Note: It is purified by distillation, and is obtained as a
           lemon-yellow powder (by sublimation), called flour, or
           flowers, of sulphur, or in cast sticks called roll
           sulphur, or brimstone. It burns with a blue flame and a
           peculiar suffocating odor. It is an ingredient of
           gunpowder, is used on friction matches, and in medicine
           (as a laxative and insecticide), but its chief use is
           in the manufacture of sulphuric acid. Sulphur can be
           obtained in two crystalline modifications, in
           orthorhombic octahedra, or in monoclinic prisms, the
           former of which is the more stable at ordinary
           temperatures. Sulphur is the type, in its chemical
           relations, of a group of elements, including selenium
           and tellurium, called collectively the sulphur group,
           or family. In many respects sulphur resembles oxygen.
           [1913 Webster]
     2. (Zool.) Any one of numerous species of yellow or orange
        butterflies of the subfamily Pierinae; as, the clouded
        sulphur ({Eurymus philodice syn. Colias philodice),
        which is the common yellow butterfly of the Eastern United
        [1913 Webster]
     Amorphous sulphur (Chem.), an elastic variety of sulphur of
        a resinous appearance, obtained by pouring melted sulphur
        into water. On standing, it passes back into a brittle
        crystalline modification.
     Liver of sulphur. (Old Chem.) See Hepar.
     Sulphur acid. (Chem.) See Sulphacid.
     Sulphur alcohol. (Chem.) See Mercaptan.
     Sulphur auratum [L.] (Old Chem.), a golden yellow powder,
        consisting of antimonic sulphide, Sb2S5, -- formerly a
        famous nostrum.
     Sulphur base (Chem.), an alkaline sulphide capable of
        acting as a base in the formation of sulphur salts
        according to the old dual theory of salts. [Archaic]
     Sulphur dioxide (Chem.), a colorless gas, SO2, of a
        pungent, suffocating odor, produced by the burning of
        sulphur. It is employed chiefly in the production of
        sulphuric acid, and as a reagent in bleaching; -- called
        also sulphurous anhydride, and formerly sulphurous
     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 a sulphacid; a sulphosalt.
     Sulphur showers, showers of yellow pollen, resembling
        sulphur in appearance, often carried from pine forests by
        the wind to a great distance.
     Sulphur trioxide (Chem.), a white crystalline solid, SO3,
        obtained by oxidation of sulphur dioxide. It dissolves in
        water with a hissing noise and the production of heat,
        forming sulphuric acid, and is employed as a dehydrating
        agent. Called also sulphuric anhydride, and formerly
        sulphuric acid.
     Sulphur whale. (Zool.) See Sulphur-bottom.
     Vegetable sulphur (Bot.), lycopodium powder. See under
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Sulphuric \Sul*phu"ric\, a. [Cf. F. sulfurique.]
     1. Of or pertaining to sulphur; as, a sulphuric smell.
        [1913 Webster]
     2. (Chem.) Derived from, or containing, sulphur;
        specifically, designating those compounds in which the
        element has a higher valence as contrasted with the
        sulphurous compounds; as, sulphuric acid.
        [1913 Webster]
     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 sulphur dioxide, oxygen
            (from the air), steam, and nitric fumes. It attacks
            and dissolves many metals and other intractable
            substances, sets free most acids from their salts, and
            is used in the manufacture of hydrochloric and nitric
            acids, of soda, of bleaching powders, etc. It is also
            powerful dehydrating agent, having a strong affinity
            for water, and eating and corroding paper, wood,
            clothing, etc. It is thus used in the manufacture of
            ether, of imitation parchment, and of nitroglycerin.
            It is also used in etching iron, in removing iron
            scale from forgings, in petroleum refining, etc., and
            in general its manufacture is the most important and
            fundamental of all the chemical industries. Formerly
            called vitriolic acid, and now popularly vitriol,
            and oil of vitriol.
     Fuming sulphuric acid, or Nordhausen sulphuric acid. See
        Disulphuric acid, under Disulphuric.
     Sulphuric anhydride, sulphur trioxide. See under Sulphur.
     Sulphuric ether, common anaesthetic ether; -- so called
        because made by the catalytic action of sulphuric acid on
        alcohol. See Ether, 3
        (a) .
            [1913 Webster]

From WordNet (r) 3.0 (2006) :

  sulphuric acid
      n 1: (H2SO4) a highly corrosive acid made from sulfur dioxide;
           widely used in the chemical industry [syn: vitriol, oil
           of vitriol, sulfuric acid, sulphuric acid]

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