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Pronunciation: az′ō-lit′min

Definition: A purplish-red coloring matter obtained from natural litmus or synthesized by oxidizing orcinol in the presence of ammonia, lime, and potash; used as a broad indicator of pH (red at 4.5, blue at 8.3).

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.