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
The gaseous diffusion plant, built in 1952, produced enriched uranium as feedstock for the U.S.'s nuclear weapons program and later for use in nuclear power plants, according to the DOE, which owns the site.
—Connor Giffin, The Courier-Journal, 6 Aug. 2025
The ore is purified, dissolved in hot acid and converted into uranium hexafluoride (UF6), a gaseous compound.
—David Bressan, Forbes.com, 26 June 2025
The images and data captured the hot region around the protostar where Earth-like planets form, and show gaseous silicon monoxide condensing into solid silicate minerals—the same materials that make up the vast majority of Earth’s crust.
—Rudy Molinek, Smithsonian Magazine, 18 July 2025
The protostar is located in the Orion B molecular cloud, around 1,300 light-years from Earth, according to the paper, and is positioned in a way that allows a direct view of its inner gaseous disk.
—Julia Jacobo, ABC News, 17 July 2025
See All Example Sentences for gaseous
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Connor Giffin, The Courier-Journal, 6 Aug. 2025
The ore is purified, dissolved in hot acid and converted into uranium hexafluoride (UF6), a gaseous compound.
—David Bressan, Forbes.com, 26 June 2025
The images and data captured the hot region around the protostar where Earth-like planets form, and show gaseous silicon monoxide condensing into solid silicate minerals—the same materials that make up the vast majority of Earth’s crust.
—Rudy Molinek, Smithsonian Magazine, 18 July 2025
The protostar is located in the Orion B molecular cloud, around 1,300 light-years from Earth, according to the paper, and is positioned in a way that allows a direct view of its inner gaseous disk.
—Julia Jacobo, ABC News, 17 July 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 21 Aug. 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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