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methyl red

noun Chemistry.

a water-insoluble solid occurring as a dark-red powder or violet crystals, C15H15N3O2, used chiefly as an acid-base indicator.

Compare methyl orange.

Origin of methyl red

First recorded in 1905–10

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019