[ '(f)θalɪk ]
■ noun Chemistry a crystalline acid derived from benzene, with two carboxylic acid groups attached to the benzene ring.
Origin
C19: shortening of naphthalic (see naphthalene ).
PHTHALIC ACID
Meaning of PHTHALIC ACID in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004