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phthalein 酞; 酞類 □; □類 Phthalein \Phthal"e*in\, n. [See {Phthalic}.] (Chem.)
One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenolphthalein. Their alkaline solutions are fluorescent. [1913 Webster] {Phenol phthalein}, a white or yellowish white crystalline substance made from phthalic acid and phenol. Same as {phenolphthalein}. [1913 Webster PJC]
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