noun
or broen·ner's acid ˈbrenə(r)z-, -rən-, -rə̄n-
Usage: usually capitalized B
Etymology: probably from the name Brönner
: a colorless crystalline naphthylaminesulfonic acid NH 2 C 10 H 6 SO 3 H used as a dye intermediate; 6-amino-2-naphthalenesulfonic acid