[gas-ee-uhs, gash-uhs]
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 ).

1790–1800; gas + -eous

gaseousness, gaseity [ga-see-i-tee] , noun
nongaseous, adjective
nongaseousness, noun
pseudogaseous, adjective
quasi-gaseous, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gaseous (ˈɡæsɪəs, -ʃəs, -ʃɪəs, ˈɡeɪ-)
of, concerned with, or having the characteristics of a gas

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
gas   (gās)  Pronunciation Key 
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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Example sentences
It has the leaden consistency and gaseous redolence of a diet thick with
Over time the gas giants migrate inward due to the irregular twisting motions
  of the gaseous disks in which they formed.
There can be no doubt that at one time our planet existed in a gaseous, then in
  a liquid condition.
Instead, it is retained by the gaseous water molecules.
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