• synonyms


[thal-ik, fthal-]
adjective Chemistry.
  1. of or derived from phthalic acid.
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Origin of phthalic

First recorded in 1855–60; (na)phthal(ene) + -ic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for phthalic

Historical Examples

  • Dilute nitric acid oxidizes it to phthalic acid, and sodium reduces it in alcoholic solution to hydrindene, C9H10.

    Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3


  • The phthaleïn formed from gallic acid and phthalic anhydride really results from the union of the latter with pyrogallol.


    Raphael Meldola

  • Phthalic acid, which was discovered in 1836 by Laurent, is a product of the oxidation of many benzenoid compounds.


    Raphael Meldola

  • It condenses with phthalic anhydride to form rhodamine, and with succinic anhydride to rhodamine S.

phthalic in Medicine


(thălĭk, fthăl-)
  1. Relating to or derived from naphthalene.
  2. Relating to phthalic acid.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.