WordReference Random House Unabridged Dictionary of American English © 2026
meth′yl or′ange, [Chem.]
  1. Chemistryan orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator. Also called gold orange, helianthine B, orange III, tropaeolin D, tropeolin D. Cf. methyl red. 
  • 1880–85

'methyl orange' also found in these entries (note: many are not synonyms or translations):
gold orange - helianthine B - methyl red - orange III - tropaeolin D - tropeolin D

Forum discussions with the word(s) "methyl orange" in the title:


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