methyl orange

noun Chemistry.

an orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator.
Compare methyl red.

Origin of methyl orange

First recorded in 1880–85
Also called gold orange, helianthine B, orange III, tropaeolin D, tropeolin D. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for gold orange