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tropeolin D

noun, Chemistry.

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 of methyl orange
1880-85 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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