• synonyms

orange III

noun Chemistry.
  1. methyl orange.
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methyl orange

noun Chemistry.
  1. an orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator.
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Compare methyl red.

Origin of methyl orange

First recorded in 1880–85
Also called gold orange, helianthine B, orange III, tropaeolin D, tropeolin D.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018