orange III


noun Chemistry.

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Definition for orange iii (2 of 2)

methyl orange

noun Chemistry.

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.
Compare methyl red.

Origin of methyl orange

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020