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3 definitions found
 for Double salt
From The Collaborative International Dictionary of English v.0.48 :

  Salt \Salt\, n. [AS. sealt; akin to OS. & OFries. salt, D. zout,
     G. salz, Icel., Sw., & Dan. salt, L. sal, Gr. ?, Russ. sole,
     Ir. & Gael. salann, W. halen, of unknown origin. Cf. Sal,
     Salad, Salary, Saline, Sauce, Sausage.]
     1. The chloride of sodium, a substance used for seasoning
        food, for the preservation of meat, etc. It is found
        native in the earth, and is also produced, by evaporation
        and crystallization, from sea water and other water
        impregnated with saline particles.
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     2. Hence, flavor; taste; savor; smack; seasoning.
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              Though we are justices and doctors and churchmen . .
              . we have some salt of our youth in us. --Shak.
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     3. Hence, also, piquancy; wit; sense; as, Attic salt.
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     4. A dish for salt at table; a saltcellar.
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              I out and bought some things; among others, a dozen
              of silver salts.                      --Pepys.
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     5. A sailor; -- usually qualified by old. [Colloq.]
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              Around the door are generally to be seen, laughing
              and gossiping, clusters of old salts. --Hawthorne.
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     6. (Chem.) The neutral compound formed by the union of an
        acid and a base; thus, sulphuric acid and iron form the
        salt sulphate of iron or green vitriol.
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     Note: Except in case of ammonium salts, accurately speaking,
           it is the acid radical which unites with the base or
           basic radical, with the elimination of hydrogen, of
           water, or of analogous compounds as side products. In
           the case of diacid and triacid bases, and of dibasic
           and tribasic acids, the mutual neutralization may vary
           in degree, producing respectively basic, neutral, or
           acid salts. See Phrases below.
           [1913 Webster]
     7. Fig.: That which preserves from corruption or error; that
        which purifies; a corrective; an antiseptic; also, an
        allowance or deduction; as, his statements must be taken
        with a grain of salt.
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              Ye are the salt of the earth.         --Matt. v. 13.
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     8. pl. Any mineral salt used as an aperient or cathartic,
        especially Epsom salts, Rochelle salt, or Glauber's salt.
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     9. pl. Marshes flooded by the tide. [Prov. Eng.]
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     Above the salt, Below the salt, phrases which have
        survived the old custom, in the houses of people of rank,
        of placing a large saltcellar near the middle of a long
        table, the places above which were assigned to the guests
        of distinction, and those below to dependents, inferiors,
        and poor relations. See Saltfoot.
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              His fashion is not to take knowledge of him that is
              beneath him in clothes. He never drinks below the
              salt.                                 --B. Jonson.
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     Acid salt (Chem.)
        (a) A salt derived from an acid which has several
            replaceable hydrogen atoms which are only partially
            exchanged for metallic atoms or basic radicals; as,
            acid potassium sulphate is an acid salt.
        (b) A salt, whatever its constitution, which merely gives
            an acid reaction; thus, copper sulphate, which is
            composed of a strong acid united with a weak base, is
            an acid salt in this sense, though theoretically it is
            a neutral salt.
     Alkaline salt (Chem.), a salt which gives an alkaline
        reaction, as sodium carbonate.
     Amphid salt (Old Chem.), a salt of the oxy type, formerly
        regarded as composed of two oxides, an acid and a basic
        oxide. [Obsolescent]
     Basic salt (Chem.)
        (a) A salt which contains more of the basic constituent
            than is required to neutralize the acid.
        (b) An alkaline salt.
     Binary salt (Chem.), a salt of the oxy type conveniently
        regarded as composed of two ingredients (analogously to a
        haloid salt), viz., a metal and an acid radical.
     Double salt (Chem.), a salt regarded as formed by the union
        of two distinct salts, as common alum, potassium aluminium
        sulphate. See under Double.
     Epsom salts. See in the Vocabulary.
     Essential salt (Old Chem.), a salt obtained by
        crystallizing plant juices.
     Ethereal salt. (Chem.) See under Ethereal.
     Glauber's salt or Glauber's salts. See in Vocabulary.
     Haloid salt (Chem.), a simple salt of a halogen acid, as
        sodium chloride.
     Microcosmic salt. (Chem.). See under Microcosmic.
     Neutral salt. (Chem.)
        (a) A salt in which the acid and base (in theory)
            neutralize each other.
        (b) A salt which gives a neutral reaction.
     Oxy salt (Chem.), a salt derived from an oxygen acid.
     Per salt (Old Chem.), a salt supposed to be derived from a
        peroxide base or analogous compound. [Obs.]
     Permanent salt, a salt which undergoes no change on
        exposure to the air.
     Proto salt (Chem.), a salt derived from a protoxide base or
        analogous compound.
     Rochelle salt. See under Rochelle.
     Salt of amber (Old Chem.), succinic acid.
     Salt of colcothar (Old Chem.), green vitriol, or sulphate
        of iron.
     Salt of hartshorn. (Old Chem.)
        (a) Sal ammoniac, or ammonium chloride.
        (b) Ammonium carbonate. Cf. Spirit of hartshorn, under
     Salt of lemons. (Chem.) See Salt of sorrel, below.
     Salt of Saturn (Old Chem.), sugar of lead; lead acetate; --
        the alchemical name of lead being Saturn.
     Salt of Seignette. Same as Rochelle salt.
     Salt of soda (Old Chem.), sodium carbonate.
     Salt of sorrel (Old Chem.), acid potassium oxalate, or
        potassium quadroxalate, used as a solvent for ink stains;
        -- so called because found in the sorrel, or Oxalis. Also
        sometimes inaccurately called salt of lemon.
     Salt of tartar (Old Chem.), potassium carbonate; -- so
        called because formerly made by heating cream of tartar,
        or potassium tartrate. [Obs.]
     Salt of Venus (Old Chem.), blue vitriol; copper sulphate;
        -- the alchemical name of copper being Venus.
     Salt of wisdom. See Alembroth.
     Sedative salt (Old Med. Chem.), boric acid.
     Sesqui salt (Chem.), a salt derived from a sesquioxide base
        or analogous compound.
     Spirit of salt. (Chem.) See under Spirit.
     Sulpho salt (Chem.), a salt analogous to an oxy salt, but
        containing sulphur in place of oxygen.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Double \Dou"ble\ (d[u^]b"'l), a. [OE. doble, duble, double, OF.
     doble, duble, double, F. double, fr. L. duplus, fr. the root
     of duo two, and perh. that of plenus full; akin to Gr.
     diplo`os double. See Two, and Full, and cf. Diploma,
     1. Twofold; multiplied by two; increased by its equivalent;
        made twice as large or as much, etc.
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              Let a double portion of thy spirit be upon me. -- 2
                                                    Kings ii. 9.
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              Darkness and tempest make a double night. --Dryden.
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     2. Being in pairs; presenting two of a kind, or two in a set
        together; coupled.
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              [Let] The swan, on still St. Mary's lake,
              Float double, swan and shadow.        --Wordsworth.
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     3. Divided into two; acting two parts, one openly and the
        other secretly; equivocal; deceitful; insincere.
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              With a double heart do they speak.    -- Ps. xii. 2.
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     4. (Bot.) Having the petals in a flower considerably
        increased beyond the natural number, usually as the result
        of cultivation and the expense of the stamens, or stamens
        and pistils. The white water lily and some other plants
        have their blossoms naturally double.
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     Note: Double is often used as the first part of a compound
           word, generally denoting two ways, or twice the number,
           quantity, force, etc., twofold, or having two.
           [1913 Webster]
     Double base, or Double bass (Mus.), the largest and
        lowest-toned instrument in the violin form; the
        contrabasso or violone.
     Double convex. See under Convex.
     Double counterpoint (Mus.), that species of counterpoint or
        composition, in which two of the parts may be inverted, by
        setting one of them an octave higher or lower.
     Double court (Lawn Tennis), a court laid out for four
        players, two on each side.
     Double dagger (Print.), a reference mark ([dag]) next to
        the dagger ([dagger]) in order; a diesis.
     Double drum (Mus.), a large drum that is beaten at both
     Double eagle, a gold coin of the United States having the
        value of 20 dollars.
     Double entry. See under Bookkeeping.
     Double floor (Arch.), a floor in which binding joists
        support flooring joists above and ceiling joists below.
        See Illust. of Double-framed floor.
     Double flower. See Double, a., 4.
     Double-framed floor (Arch.), a double floor having girders
        into which the binding joists are framed.
     Double fugue (Mus.), a fugue on two subjects.
     Double letter.
        (a) (Print.) Two letters on one shank; a ligature.
        (b) A mail requiring double postage.
     Double note (Mus.), a note of double the length of the
        semibreve; a breve. See Breve.
     Double octave (Mus.), an interval composed of two octaves,
        or fifteen notes, in diatonic progression; a fifteenth.
     Double pica. See under Pica.
     Double play (Baseball), a play by which two players are put
        out at the same time.
     Double plea (Law), a plea alleging several matters in
        answer to the declaration, where either of such matters
        alone would be a sufficient bar to the action. --Stephen.
     Double point (Geom.), a point of a curve at which two
        branches cross each other. Conjugate or isolated points of
        a curve are called double points, since they possess most
        of the properties of double points (see Conjugate). They
        are also called acnodes, and those points where the
        branches of the curve really cross are called crunodes.
        The extremity of a cusp is also a double point.
     Double quarrel. (Eccl. Law) See Duplex querela, under
     Double refraction. (Opt.) See Refraction.
     Double salt. (Chem.)
        (a) A mixed salt of any polybasic acid which has been
            saturated by different bases or basic radicals, as the
            double carbonate of sodium and potassium,
        (b) A molecular combination of two distinct salts, as
            common alum, which consists of the sulphate of
            aluminium, and the sulphate of potassium or ammonium.
     Double shuffle, a low, noisy dance.
     Double standard (Polit. Econ.), a double standard of
        monetary values; i. e., a gold standard and a silver
        standard, both of which are made legal tender.
     Double star (Astron.), two stars so near to each other as
        to be seen separate only by means of a telescope. Such
        stars may be only optically near to each other, or may be
        physically connected so that they revolve round their
        common center of gravity, and in the latter case are
        called also binary stars.
     Double time (Mil.). Same as Double-quick.
     Double window, a window having two sets of glazed sashes
        with an air space between them.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  double salt
      n 1: a solution of two simple salts that forms a single
           substance on crystallization

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