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[gas-ee-uh s, gash-uh s] /ˈgæs i əs, ˈgæʃ əs/
existing in the state of a gas; not solid or liquid.
pertaining to or having the characteristics of gas.
Informal. lacking firmness or solidity; uncertain; not definite.
gassy (defs 1, 3).
Origin of gaseous
First recorded in 1790-1800; gas + -eous
Related forms
gaseousness, gaseity
[ga-see-i-tee] /gæˈsi ɪ ti/ (Show IPA),
nongaseous, adjective
nongaseousness, noun
pseudogaseous, adjective
quasi-gaseous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for gaseous
Contemporary Examples
Historical Examples
  • The laughter that followed the exposure of this gaseous trick may be imagined.

  • Huggins has found that the spectrum of this nebula is not gaseous.

    Aether and Gravitation

    William George Hooper
  • Occupying so much bulk it could not have been solid, nor yet liquid, but it might have been gaseous.

    Pioneers of Science Oliver Lodge
  • Some of the nebulæ are now known to be gaseous, and some of them at least are in a state of rotation.

    Pioneers of Science Oliver Lodge
  • It seems strange, indeed, that any gaseous mass should move at such a speed!

    Astronomy of To-day Cecil G. Dolmage
  • They contain within them stars, clusters, and gaseous nebulæ.

    Astronomy of To-day Cecil G. Dolmage
  • All fuels must be put into a gaseous state before they will burn.

    Motors James Slough Zerbe
  • It will take just double the amount of fuel to convert the water into a gaseous state.

    Motors James Slough Zerbe
British Dictionary definitions for gaseous


/ˈɡæsɪəs; -ʃəs; -ʃɪəs; ˈɡeɪ-/
of, concerned with, or having the characteristics of a gas
Derived Forms
gaseousness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for gaseous

1799, from gas (n.) + -ous.

Online Etymology Dictionary, © 2010 Douglas Harper
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gaseous in Medicine

gaseous gas·e·ous (gās'ē-əs, gāsh'əs)

  1. Of, relating to, or existing as a gas.

  2. Full of or containing gas; gassy.

gas'e·ous·ness n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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gaseous in Science
One of four main states of matter, composed of molecules in constant random motion. Unlike a solid, a gas has no fixed shape and will take on the shape of the space available. Unlike a liquid, the intermolecular forces are very small; it has no fixed volume and will expand to fill the space available.

gaseous adjective (gās'ē-əs, gāsh'əs)
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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