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orthophthalic acid

[awr-thuh-thal-ik, -thuh f-thal-]
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noun Chemistry.
  1. See under phthalic acid(def 1).

Origin of orthophthalic acid

phthalic acid

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.

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 orthophthalic 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

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

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

orthophthalic 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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