phthalic anhydride

noun Chemistry.
a white, crystalline, slightly water-soluble solid, C 8 H 4 O 3 , used chiefly in the manufacture of dyes, alkyd resins, and plasticizers.

Origin:
1850–55

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Collins
World English Dictionary
phthalic anhydride
 
n
a white crystalline substance used mainly in producing dyestuffs. Formula: C6H4(CO)2O

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

phthalic anhydride n.
A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
phthalic anhydride  
A white crystalline compound prepared by oxidizing naphthalene and used in the manufacture of phthaleins and other dyes, resins, plasticizers, and insecticides. Chemical formula: C8H4O3.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Definition: o-xylene is an aromatic hydrocarbon, used in the production of phthalic anhydride.
MA also is a byproduct of the production of phthalic anhydride.
Naphthalene's principal use is as an intermediate in the production of phthalic anhydride.
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