gaseous

1 of 2

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

gaseousness

2 of 2

noun

gas·​e·​ous·​ness

plural -es

: the quality or state of being gaseous

often : effervescence

Synonyms of gaseous

Adjective

• rhetorical
• inflated
• gassy

Examples of gaseous in a Sentence

Adjective

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

Adjective

The vast majority of living organisms, however, are not able to use nitrogen in its gaseous form. — Encyclopedia Britannica, 9 Sep. 2026

The sky reminds Laurel less of Earth than of some gaseous planet, streams of indigo and violet and shocking pink, the setting sun layered between them. — ABC News, 31 Aug. 2026

This is thought to be because intense stellar radiation strips planets of their gaseous layers effectively shrinking them. — Robert Lea, Space.com, 26 Aug. 2026

Scientists have observed this instability pattern in lake and ocean waves, cloud formation and the atmospheres of large gaseous planets such as Jupiter and Saturn. — Ashley Strickland, CNN Money, 5 Aug. 2026

Word History

First Known Use

Adjective

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