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[thal-ik, fthal-] /ˈθæl ɪk, ˈfθæl-/
adjective, Chemistry.
of or derived from phthalic acid.
Origin of phthalic
First recorded in 1855-60; (na)phthal(ene) + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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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.

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

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

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

phthalic in Medicine

phthalic phthal·ic (thāl'ĭk, fthāl'-)

  1. Relating to or derived from naphthalene.

  2. Relating to phthalic acid.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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