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From The Collaborative International Dictionary of English v.0.48:
Nitrosyl \Ni*tro"syl\, n. [Nitroso- + -yl.] (Chem.) The radical -NO, called also the nitroso group. The term is sometimes loosely used to designate certain nitro compounds; as, nitrosyl sulphuric acid. Used also adjectively. [1913 Webster]