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 Webster]

{Phenol phthalein}, a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids, and as this reaction is exceedingly delicate it is used as an indicator. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • 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 — /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 — One of a group of highly colored compounds based on a triphenylmethyl base; e.g., phenolphthalein. * * * phtha·lein thal ē ən, thal .ēn, thāl n any of various xanthene dyes (as phenolphthalein or fluorescein) that are intensely colored in… …   Medical dictionary

  • 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

  • phthalein — n. chemical compound used in the production of dyes …   English contemporary dictionary

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