isophthalic acid

[ ahy-suh-thal-ik, ahy-suh- ]
/ ˈaɪ səˈθæl ɪk, ˌaɪ sə- /

noun Chemistry.

a colorless, crystalline, slightly water-soluble solid, C8H6O2, the meta isomer of phthalic acid: used chiefly in the manufacture of resins and plasticizers.

Origin of isophthalic acid

First recorded in 1865–70; iso- + phthalic