• synonyms


[gas-ee-uh s, gash-uh s]
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  1. existing in the state of a gas; not solid or liquid.
  2. pertaining to or having the characteristics of gas.
  3. Informal. lacking firmness or solidity; uncertain; not definite.
  4. gassy(defs 1, 3).
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Origin of gaseous

First recorded in 1790–1800; gas + -eous
Related formsgas·e·ous·ness, gas·e·i·ty [ga-see-i-tee] /gæˈsi ɪ ti/, nounnon·gas·e·ous, adjectivenon·gas·e·ous·ness, nounpseu·do·gas·e·ous, adjectivequa·si-gas·e·ous, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for gaseous


  1. of, concerned with, or having the characteristics of a gas
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Derived Formsgaseousness, 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

Word Origin and History for gaseous


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

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Online Etymology Dictionary, © 2010 Douglas Harper

gaseous in Medicine


(găsē-əs, găshəs)
  1. Of, relating to, or existing as a gas.
  2. Full of or containing gas; gassy.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

gaseous in Science


  1. 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.
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Related formsgaseous adjective (găsē-əs, găshəs)
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.