One of a group of highly colored compounds based on a triphenylmethyl base; e.g., phenolphthalein.

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phtha·lein 'thal-ē-ən, 'thal-.ēn, 'thāl- n any of various xanthene dyes (as phenolphthalein or fluorescein) that are intensely colored in alkaline solution

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phthal·ein (thalґēn) any of a series of coloring matters formed by the condensation of phthalic anhydride with the phenols; some have a cathartic action. See phenolphthalein.

Medical dictionary. 2011.

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  • 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 phenol phthale[ i]n. Their alkaline solutions are fluorescent. [1913… …   The Collaborative International Dictionary of English

  • phthalein — [thal′ēn΄, thal′ē in; fthal′ēn] n. [< PHTHALIC ACID + IN1] any of a group of synthetic dyes manufactured from phenols and phthalic anhydride …   English World dictionary

  • phthalein — iodo·phthalein; phe·nol·phthalein; phthalein; sul·fone·phthalein; sul·fo·bro·mo·phthalein; sul·fon·phthalein; …   English syllables

  • phthalein — ˈthalēə̇n, āl , ˌlēn noun also phthalein dye ( s) Etymology: International Scientific Vocabulary phthal + ein : any of a group of xanthene dyes (as phenolphthalein, fluorescein, rhodamine) that are intensely colored in alkaline solution and are… …   Useful english dictionary

  • phthalein dye — noun see phthalein …   Useful english dictionary

  • phthalein — /thal een, ee in, fthal /, n. Chem. any of a group of compounds formed by treating phthalic anhydride with phenols, from which certain important dyes are derived. [1900 05; (NA)PHTHALE(NE) + IN2] * * * …   Universalium

  • phthalein — noun any of a range of lactones formed by the reaction of phenols with phthalic anhydride …   Wiktionary

  • Phthalein — Phtha|le|in 〈n. 11; unz.; Chem.〉 aus Phthalsäureanhydrid u. Phenolen hergestellter Triphenylmethanfarbstoff, z. B. Phenolphthalein u. Fluoreszein, Xanthenfarbstoff [→ Naphthalin] * * * Phtha|le|in [↑ Phthal ], das; s, e: Gruppenbez. für 3,3… …   Universal-Lexikon

  • Phthalein — Phtha|le|in 〈n.; Gen.: s; Pl.: unz.; Chemie〉 aus Phthalsäureanhydrid u. Phenolen hergestellter Farbstoff, z. B. Phenolphthalein u. Fluoreszein [Etym.: Kunstwort <Naphthalin] …   Lexikalische Deutsches Wörterbuch

  • Phthalein — Phtha|le|in das; s, e <zu ↑> synthetischer Farbstoff (z. B. Eosin) …   Das große Fremdwörterbuch

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