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orange III

noun, Chemistry.

methyl orange

noun, Chemistry.
1.
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
1880-1885
First recorded in 1880-85
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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