isophthalic acid

[ ahy-suh-thal-ik, ahy-suh- ]

noun

, Chemistry.

1. a colorless, crystalline, slightly water-soluble solid, C 8 H 6 O 2 , the meta isomer of phthalic acid: used chiefly in the manufacture of resins and plasticizers.

Word History and Origins

Origin of isophthalic acid¹

First recorded in 1865–70; iso- + phthalic