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Medical Definition of Methyl red
1. C15H15N3O2;a weakly acid dye used as a pH indicator (red at 4.8, yellow at 6.0); easily reduced with loss of colour, and pH readings must be made rapidly. (05 Mar 2000)
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1. C15H15N3O2;a weakly acid dye used as a pH indicator (red at 4.8, yellow at 6.0); easily reduced with loss of colour, and pH readings must be made rapidly. (05 Mar 2000)