Definition of phthalic acid in English:

phthalic acid

Line breaks: phthal¦ic acid
Pronunciation: /ˈ(f)θalɪk
 
/

noun

Chemistry
  • A crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring.
    • Chemical formula: C6H4(COOH)2; three isomers
    More example sentences
    • Alkyd is produced by condensation reactions between polycarboxylic acids and polyhydric alcohols - often phthalic acid or anhydride and glycerol.
    • A wide range of uses has been found for various phthalic acid esters, with the largest portion of these esters being used as plasticizing agents for polyvinyl chloride products.
    • Capillaries were immersed in phthalic acid, which has an index of refraction that effectively eliminates optical refraction at the outer wall.

Origin

mid 19th century: phthalic, shortening of naphthalic (see naphthalene).

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