1
: having the form of or being gas
also
: of or relating to gases
2
a
: lacking substance or solidity
b
: gassy sense 3
trick phrases and gaseous circumlocutions—
Edwin Newman
Edwin Newman
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
Each color in the model corresponds to different temperatures and altitudes within WASP-18 b’s gaseous atmosphere.
—Eric Lagatta, USA Today, 30 Oct. 2025
The brightening occurred as an increase in heat radiation from the sun vaporized icy materials embedded in its structure, creating a gaseous shell around its nucleus.
—Anthony Wood, Space.com, 26 Oct. 2025
What’s in the Exhaust The strongest contributors to ozone loss from rockets are gaseous chlorine and soot.
—New Atlas, 25 Oct. 2025
All living things need the element to make biomolecules such as DNA, but most species can’t make use of the N2 molecule, nitrogen’s gaseous form.
—Katherine Bourzac, Quanta Magazine, 15 Sep. 2025
See All Example Sentences for gaseous
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Eric Lagatta, USA Today, 30 Oct. 2025
The brightening occurred as an increase in heat radiation from the sun vaporized icy materials embedded in its structure, creating a gaseous shell around its nucleus.
—Anthony Wood, Space.com, 26 Oct. 2025
What’s in the Exhaust The strongest contributors to ozone loss from rockets are gaseous chlorine and soot.
—New Atlas, 25 Oct. 2025
All living things need the element to make biomolecules such as DNA, but most species can’t make use of the N2 molecule, nitrogen’s gaseous form.
—Katherine Bourzac, Quanta Magazine, 15 Sep. 2025
See All Example Sentences for gaseous
Cite this Entry
“Gaseous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gaseous. Accessed 1 Nov. 2025.
Copy CitationKids Definition
gaseous
adjective
gas·eous
ˈgas-ē-əs 
ˈgash-əs
1
: having the form of or being gas
2
: of or relating to gas
3
: lacking solidity
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