Learn how to say Phthalic correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word phthalic acid:
a crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring.
Chemical formula: C6H4(COOH)2; three isomers
mid 19th century: phthalic, shortening of naphthalic (see naphthalene)