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From The Collaborative International Dictionary of English v.0.48:
Hydroxylamine \Hy*drox`yl*am"ine\, n. [Hydroxyl + amine.] (Chem.) A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent. [1913 Webster]