[ hahy-druh-zeen ]
/ ˈhaɪ drəˌzin /


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.
a class of substances derived by replacing one or more hydrogen atoms in hydrazine by an organic group.

Nearby words

  1. hydraulic suspension,
  2. hydraulic torque converter,
  3. hydraulics,
  4. hydraulus,
  5. hydrazide,
  6. hydrazoate,
  7. hydrazoic,
  8. hydrazoic acid,
  9. hydrazone,
  10. hydremia

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. 2019

Examples from the Web for hydrazine

British Dictionary definitions for hydrazine


/ (ˈhaɪdrəˌziːn, -zɪn) /


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

Word Origin for hydrazine

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

Science definitions for hydrazine


[ hīdrə-zēn′, -zĭn ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.