Dictionary![]() ![]() meth'yl or'angeChem. an 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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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