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The Collaborative International Dictionary
nitro group

Nitroxyl \Ni*trox"yl\, n. [Nitro- + oxygen + -yl.] (Chem.) The group -NO2, usually called the nitro group.

WordNet
nitro group

n. the group -NO3

Usage examples of "nitro group".

The presence of a nitro group (-NO2) in addition has not yet been confirmed, and no evidence as yet exists as to the nature of the hydrocarbon nucleus, though an at least partly aromatic structure seems certain.