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See more synonyms for hydrazine on Thesaurus.com
  1. Also called diamine. a colorless, oily, fuming liquid, N2H4, that is a weak base in solution and forms a large number of salts resembling ammonium salts: used chiefly as a reducing agent and a jet-propulsion fuel.
  2. a class of substances derived by replacing one or more hydrogen atoms in hydrazine by an organic group.
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Origin of hydrazine

First recorded in 1885–90; hydr-2 + az- + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for hydrazine

Historical Examples

  • On digestion of its warm aqueous solution with warm dilute sulphuric acid, hydrazine sulphate and oxalic acid are obtained.

    Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 1


  • They want us to send them the quality control specification for the hydrazine that was used as fuel in the first launch.

  • Amidoguanidine is a body of hydrazine type, for it reduces gold and silver salts and yields a benzylidine derivative.

  • While they're unloading the G-boat, I wish you'd get the tanks refilled with hydrazine and nitric acid.

    Atom Drive

    Charles Louis Fontenay

  • "If we had a franchise, we could force Space Fuels to sell us hydrazine," said Deveet unhappily.

    Atom Drive

    Charles Louis Fontenay

British Dictionary definitions for hydrazine


  1. a colourless basic liquid made from sodium hypochlorite and ammonia: a strong reducing agent, used chiefly as a rocket fuel. Formula: N 2 H 4
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Word Origin

C19: from hydro- + azo- + -ine ²
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

hydrazine in Science


[hīdrə-zēn′, -zĭn]
  1. A colorless, fuming, corrosive liquid with an odor like ammonia that is a powerful reducing agent. It can be combined with organic compounds to form jet and rocket fuels and is also used to make explosives, fungicides, medicines, and photographic chemicals. Chemical formula: N2H4.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.