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The Collaborative International Dictionary of English v.0.48 (gcide)

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]


Diamide \Di*am"ide\ (?; 104), n. [Pref. di- amide.] (Chem.)
Any compound containing two amido groups united with one or
more acid or negative radicals, -- as distinguished from a
diamine. Cf. Amido acid, under {Amido}, and Acid amide, under
{Amide}.
[1913 Webster]

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