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3 definitions found
 for Methyl orange
From The Collaborative International Dictionary of English v.0.48 :

  Methyl \Meth"yl\, n. [See Methylene.] (Chem.)
     A univalent hydrocarbon radical, CH3-, not existing alone
     but regarded as an essential residue of methane, and
     appearing as a component part of many derivatives; as, methyl
     alcohol, methyl ether, methyl amine, etc. [Formerly written
     also methule, methyle, etc.]
     [1913 Webster]
     Methyl alcohol (Chem.), a light, volatile, inflammable
        liquid, CH3.OH, obtained by the distillation of wood,
        and hence called wood alcohol or wood spirit;
        tecnically referred to as methanol; -- called also
        methol, carbinol, etc.
     Methyl amine (Chem.), a colorless, inflammable, alkaline
        gas, CH3.NH2, having an ammoniacal, fishy odor. It is
        produced artificially, and also occurs naturally in
        herring brine and other fishy products. It is regarded as
        ammonia in which a third of its hydrogen is replaced by
        methyl, and is a type of the class of substituted
     Methyl ether (Chem.), a light, volatile ether CH3.O.CH3,
        obtained by the etherification of methyl alcohol; --
        called also methyl oxide or dimethyl ether.
     Methyl green. (Chem.) See under Green, n.
     Methyl orange. (Chem.) See Helianthin.
     Methyl violet (Chem.), an artificial dye, consisting of
        certain methyl halogen derivatives of rosaniline.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Helianthin \He`li*an"thin\, n. [Prob. fr. L. helianthes, or NL.
     helianthus, sunflower, in allusion to its color.] (Chem.)
     An artificial, orange dyestuff, analogous to tropaolin, and
     like it used as an indicator in alkalimetry; -- called also
     methyl orange.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

  methyl orange
      n 1: an azo dye used as an acid-base indicator; used for
           titrations involving weak bases

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