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methyl orange definitions

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WordNet (r) 3.0 (2005)

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

Merriam Webster's

noun Date: 1881 an alkaline dye used as a chemical indicator

Webster's 1913 Dictionary

; -- 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 ammonias. Methyl ether (Chem.), a light, volatile ether CH3.O.CH3, obtained by the etherification of methyl alcohol; -- called also methyl oxide. 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.

Webster's 1913 Dictionary

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.