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H2N–NH2, an oily liquid from which phenylhydrazine and similar products are derived. It is very toxic and possibly a carcinogen.
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hy·dra·zine 'hī-drə-.zēn n a colorless fuming corrosive strongly reducing liquid base N2H4 used in the production of various materials (as pharmaceuticals and plastics) also an organic base derived from this compound
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hy·dra·zine (hiґdrə-zēn) a toxic, irritant, carcinogenic, colorless, gaseous diamine, H2N·NH2; also any member of a group of its substitution derivatives.Medical dictionary. 2011.