noun
: an unstable acid HNO 2 known only in pale blue solutions and especially in the form of its salts and used chiefly in diazotization processes
noun
: an unstable acid HNO 2 known only in pale blue solutions and especially in the form of its salts and used chiefly in diazotization processes
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012