| ̷ ̷ ̷ ̷|änik- noun
Etymology: International Scientific Vocabulary, from naphthy laminesulf onic
: a crystalline naphthylaminesulfonic acid made by baking a mixture of alpha-naphthylamine and sulfuric acid and used in the preparation of Congo red and other dyes; 4-amino-1-naphthalenesulfonic acid