tropeolin d.

methyl orange

noun Chemistry.
an orange-yellow, slightly water-soluble powder, C 1 4 H 1 4 N 3 NaO 3 S, used chiefly as an acid-base indicator.
Also called gold orange, helianthine B, orange III, tropaeolin D, tropeolin D.
Compare methyl red.


Origin:
1880–85

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WordNet
methyl orange

noun
an azo dye used as an acid-base indicator; used for titrations involving weak bases 
WordNet® 3.0, © 2006 by Princeton University.
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