[thal-ik, fthal-]

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 Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for phthalic

Historical Examples of phthalic

  • 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.


    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-]


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