hy·dra·zine | \ˈhī-drə-ˌzēn \

Definition of hydrazine 

: a colorless fuming corrosive strongly reducing liquid base N2H4 used especially in fuels for rocket and jet engines also : an organic base derived from this compound

Examples of hydrazine in a Sentence

Recent Examples on the Web

In modern rockets, such as the Space X Falcon 9 or the Saturn V, the propulsion system is powered by a fast, exothermic reaction between a liquid fuel (usually hydrogen, methane or hydrazine) and oxidizer (usually oxygen or nitrogen tetroxide). Renee Morad, Scientific American, "Build the Best Alka-Rocket Ever—with Science," 7 Sep. 2017 If that happens, people are warned not to touch or breathe any vapors from debris that could be contaminated with highly toxic hydrazine fuel. James Dean, USA TODAY, "Chinese station falling from space, but chances of being hit are low," 31 Mar. 2018 The space junk may be contaminated with hydrazine, a toxic rocket fuel, experts have said. Mike Wall, Scientific American, "Chinese Space Station Tiangong-1 Falls to Earth," 2 Apr. 2018 Debris may contain a highly toxic and corrosive substance called hydrazine. Omar Abdel-baqui, Detroit Free Press, "Tracking Chinese space station: Pieces may fall in Michigan," 29 Mar. 2018 Debris from the station could be hazardous, though, as the craft is carrying a highly toxic and corrosive substance called hydrazine. Kale Williams, OregonLive.com, "Rogue space station crashing to earth could litter Oregon with space trash," 28 Mar. 2018 The debris could very well contain traces of hydrazine or other nasty propellants best not touched. Eric Berger, Ars Technica, "Chinese space station will fall to Earth within two weeks," 23 Mar. 2018 The APUs used toxic hydrazine to generate the hydraulic power needed to move the shuttle's elevons the muscle needed for braking and steering. William Harwood, CBS News, "John Young, legendary moonwalker and shuttle commander, dead at 87," 6 Jan. 2018 To maneuver, Cassini carefully places monomethyl hydrazine in contact with nitrogen tetroxide, which spontaneously oxidizes (burns) it. Dave Brody Executive Producer, Fox News, "Why kill Cassini? Saturn probe's fate carefully considered," 19 July 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hydrazine.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of hydrazine

1887, in the meaning defined above

History and Etymology for hydrazine

International Scientific Vocabulary

Keep scrolling for more

Learn More about hydrazine

Statistics for hydrazine

Look-up Popularity

Time Traveler for hydrazine

The first known use of hydrazine was in 1887

See more words from the same year

Keep scrolling for more

More Definitions for hydrazine


hy·dra·zine | \ˈhī-drə-ˌzēn \

Medical Definition of hydrazine 

: 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

More from Merriam-Webster on hydrazine

Britannica English: Translation of hydrazine for Arabic Speakers

Britannica.com: Encyclopedia article about hydrazine

Comments on hydrazine

What made you want to look up hydrazine? Please tell us where you read or heard it (including the quote, if possible).


to reject or criticize sharply

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Roman Mythology Quiz

  • the-triumph-of-venus-by-alessandro-magnasco
  • Boreal comes from the name of the ancient Greek god of which wind?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.


Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!