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]