hydrazine

[hahy-druh-zeen]
noun
1.
Also called diamine. a colorless, oily, fuming liquid, N 2 H 4 , 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.

Origin:
1885–90; hydr-2 + az- + -ine2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hydrazine (ˈhaɪdrəˌziːn, -zɪn)
 
n
a colourless basic liquid made from sodium hypochlorite and ammonia: a strong reducing agent, used chiefly as a rocket fuel. Formula: N2H4
 
[C19: from hydro- + azo- + -ine²]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hydrazine   (hī'drə-zēn', -zĭn)  Pronunciation Key 
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

hydrazine

(N2H4), one of a series of compounds called hydronitrogens and a powerful reducing agent. It is used in the synthesis of various pesticides, as a base for blowing agents that make the holes in foam rubber, and as a corrosion inhibitor in boilers. Hydrazine is a colourless liquid with an ammonia-like odor. It has a melting point of 2.0 C (35.6 F) and a boiling point of 113.5 C (236.3 F). It readily absorbs moisture to form the hydrate N2H4H2O.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The spacecraft contains hydrazine, a rocket fuel, according to a government
  official who spoke on condition of anonymity.
Cartwright said it was unlikely that the fireball could have been caused by
  anything other than the hydrazine in the tank.
Given that there's no fuel, that would indicate that there's a hydrazine fire.
It's made using extremely toxic, caustic hydrazine and is highly unstable.
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