gas·​eous | \ˈga-sē-əs, ˈga-shəs\

Definition of gaseous 

1 : having the form of or being gas also : of or relating to gases

2a : lacking substance or solidity

b : gassy sense 3 trick phrases and gaseous circumlocutions— Edwin Newman

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Other Words from gaseous

gaseousness noun

Examples of gaseous in a Sentence

a substance changing from a liquid to a gaseous state a pompous professor known for his gaseous lectures that often put students to sleep

Recent Examples on the Web

The waxing gibbous moon dances with the large, gaseous Jupiter on the evening of June 23 in the southeast. Blaine Friedlander, Washington Post, "Space nerds, mark your calendar — Astronomy night on the Mall is Saturday," 20 June 2018 The gaseous hydrogen that will power the trains will be pumped in from a 40-foot-high steel container near the tracks at Bremervörde station. David Grossman, Popular Mechanics, "First Hydrogen-Powered Trains Rolling in Germany," 19 Sep. 2018 Scientists can then make some guesses as to whether the planet is rocky or gaseous. Brian Resnick, Vox, "NASA retired Kepler, a telescope that discovered thousands of worlds beyond our solar system," 1 Nov. 2018 The results are helping fill in details of her hypothesis that the moon was formed from a stew of gaseous rock surrounding the early earth—and solve a 50-year-old mystery. Joe Barrett, WSJ, "MacArthur ‘Genius Grant’ Winners Include Sci-Fi Junkie and an MIT Economist," 4 Oct. 2018 Researchers believe that about half of the carbon remains in its pure form while the rest of it binds with hydrogen, creating either greasy aliphatic carbon or gaseous naphthalene, the stuff used in mothballs. Jason Daley, Smithsonian, "Our Galaxy Is Really Greasy and Smells Like Moth Balls," 28 June 2018 The oily gaseous mixture then deposits on the intake valves via the positive crankcase ventilation, or PCV, system. Bob Weber,, "Drivers can ship your car cross country," 8 July 2018 His team concluded that the unexpected motion of Oumuamua had to be caused by the spewing out of small quantities of gaseous materials from its surface. David Freeman /, NBC News, "Mysterious 'Oumuamua' space object has finally been identified," 1 July 2018 The gaseous Jupiter reached opposition May 8, and Mars gets to opposition July 27. Blaine P. Friedlander Jr., Washington Post, "Skywatch: Saturn, Jupiter and Mars heading for opposition in June and July," 2 June 2018

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

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First Known Use of gaseous

1799, in the meaning defined at sense 1

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Statistics for gaseous

Last Updated

11 Dec 2018

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Time Traveler for gaseous

The first known use of gaseous was in 1799

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More Definitions for gaseous



English Language Learners Definition of gaseous

: having the form of gas


gas·​eous | \ˈga-sē-əs, ˈga-shəs\

Kids Definition of gaseous

1 : having the form of gas The substance changed from a liquid to a gaseous state.

2 : of or relating to gas gaseous odors


gas·​eous | \ˈgas-ē-əs, ˈgash-əs \

Medical Definition of gaseous 

: having the form of or being gas also : of or relating to gases

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More from Merriam-Webster on gaseous

Thesaurus: All synonyms and antonyms for gaseous

Spanish Central: Translation of gaseous

Nglish: Translation of gaseous for Spanish Speakers

Britannica English: Translation of gaseous for Arabic Speakers

Comments on gaseous

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


the figure or shape of a crescent moon

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