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

• rhetoric
• rhetorical

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

During this phase, volatile organic compounds are released and partially converted to gaseous products while solid carbonaceous residues (biochar) are retained. —David Blekhman, Forbes.com, 9 July 2025

The result is the direct production of gaseous ammonia (NH3). —Abhimanyu Ghoshal, New Atlas, 7 July 2025

Compared to its predecessors, Perseverance uses an advanced abrading bit and gaseous Dust Removal Tool, or gDRT, which applies five puffs of nitrogen to clear samples in a way that poses less risk of contamination. —Samantha Mathewson, Space.com, 30 June 2025

Stars can be seen shining above the outline of our planet's dense, gaseous atmosphere as the sun sets, while city lights and lightning storms play across the cloudy vista below. —Anthony Wood, Space.com, 12 June 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