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orthophthalic acid

[awr-thuh-thal-ik, -thuh f-thal-] /ˌɔr θəˈθæl ɪk, -θəfˈθæl-/
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 C 8 H 6 O 4 , especially the ortho isomer (orthophthalic acid) a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.
Origin
1855-60
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for orthophthalic acid

phthalic acid

/ˈθælɪk; ˈfθæl-/
noun
1.
a soluble colourless crystalline acid used in the synthesis of dyes and perfumes; 1,2-benzenedicarboxylic acid. Formula: C6H4(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
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orthophthalic acid in Medicine

phthalic acid n.
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.
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orthophthalic acid in Science
phthalic acid
  (thāl'ĭk, fthāl'-)   
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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