methyl orange

noun

: an alkaline dye used as a chemical indicator

Word History

First Known Use

1881, in the meaning defined above

Kids Definition

methyl orange

noun

: an alkaline liquid mixture used as a dye to indicate the presence of acid

Medical Definition

methyl orange

noun

: a basic azo dye C₁₄H₁₄N₃NaO₃S that is used chiefly as an acid-base indicator and whose dilute solution is yellow when neutral and pink when acid