What is "sulfanilic acid"

n. (context organic compound English) The compound ''p-aminobenzenesulfonic acid'', used in the manufacture of dyes and pharmaceuticals.

n. a crystalline acid made from aniline and used as a dye [syn: sulphanilic acid]

Sulfanilic acid (4-aminobenzenesulfonic acid ) is an off-white crystalline solid which finds application in quantitative analysis of nitrate and nitrite ions. The solid acid exists as a zwitterion, and has an unusually high melting point.