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Definition of: phthalein
(thal′ē·in, -ēn, fthal′-) noun Chem.
Any one of a series of organic compounds formed, with elimination of water, by the combination of a phenol with phthalic acid or its anhydride. Some compounds of phthalein are coloring matters. Also phthal′e·ine. [<PHTHAL(IC) + -ein, var. of -IN]
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