methyl orange

noun

Definition of methyl orange 

: an alkaline dye used as a chemical indicator

First Known Use of methyl orange

1881, in the meaning defined above

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The first known use of methyl orange was in 1881

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methyl orange

noun

Medical Definition of methyl orange 

: 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

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