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phthalic acid

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noun
  1. Chemistry. any of three isomeric acids having the formula C8H6O4, especially the ortho isomer (orthophthalic acid), a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
  2. isophthalic acid.
  3. terephthalic acid.
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Origin of phthalic acid

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for phthalic acid

phthalic acid

noun
  1. a soluble colourless crystalline acid used in the synthesis of dyes and perfumes; 1,2-benzenedicarboxylic acid. Formula: C 6 H 4 (COOH) 2
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Word Origin

C19 phthalic, from phthal- (see phthalein) + -ic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

phthalic acid in Medicine

phthalic acid

n.
  1. A colorless crystalline organic acid prepared from naphthalene and used in the synthesis of dyes and other organic compounds.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

phthalic acid in Science

phthalic acid

[thălĭk, fthăl-]
  1. A colorless, crystalline organic acid prepared from naphthalene and used in the synthesis of dyes, perfumes, and other organic compounds. Chemical formula: C8H6O4.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.