H2NNH2
Hydrazine Hy"dra*zine, n. [Hydr- + azo- + -ine.] (Chem.) Any one of a series of nitrogenous bases, resembling the amines and produced by the reduction of certain nitroso and diazo compounds; as, methyl hydrazine, phenyl hydrazine, etc. They are derivatives of hydrazine proper, {H2N.NH2}, which is a doubled amido group, recently (1887) isolated as a stable, colorless gas, with a peculiar, irritating odor. As a base it forms distinct salts. Called also {diamide}, {amidogen}, (or more properly {diamidogen}), etc. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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