gaseous

adjective

gas·​eous ˈga-sē-əs  ˈga-shəs 

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

gaseousness noun

Synonyms

• bombastic
• flatulent
• fustian
• gassy
• grandiloquent
• oratorical
• orotund
• rhetorical
• rhetoric
• windy

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

And as Ick explains when Kent asks him what will happen when the ice melts, the frozen gas shifts directly from a solid to a gaseous state, rather than melting into a liquid. —ArsTechnica, 2 Apr. 2025

Most moons are airless or boast little more than gauzy, gaseous veils. —Elise Cutts, Quanta Magazine, 12 Mar. 2025

Astronomers can hunt for signatures of elements in planets and their atmospheres and determine the ratio of rocky matter to icy gaseous matter present when the planet was born. —Robert Lea, Space.com, 3 Feb. 2025

This provides scientists with valuable data on how their formation compares to that of a star or brown dwarf, the term given to large gaseous planets that fail to develop into stars. —Javier Carbajal, WIRED, 25 Mar. 2025

Word History

First Known Use

1799, in the meaning defined at sense 1

Rhymes for gaseous

• caseous

Kids 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

Medical Definition

gaseous

adjective

gas·​eous ˈgas-ē-əs  ˈgash-əs 

: having the form of or being gas

also : of or relating to gases