- of, concerned with, or having the characteristics of a gas
WordReference Random House Learner's Dictionary of American English © 2026
gas•e•ous /ˈgæsiəs, ˈgæʃəs/USA pronunciation adj.
WordReference Random House Unabridged Dictionary of American English © 2026- having the form or characteristics of gas:a gaseous smell.
gas•e•ous
(gas′ē əs, gash′əs),USA pronunciation adj.
gas′e•ous•ness, gas•e•i•ty
(ga sē′i tē),USA pronunciation n.
- Physicsexisting in the state of a gas; not solid or liquid.
- Physicspertaining to or having the characteristics of gas.
- [Informal.]lacking firmness or solidity;
uncertain;
not definite. - gassy (defs. 1, 3).
- gas + -eous 1790–1800
Collins Concise English Dictionary © HarperCollins Publishers::
gaseous /ˈɡæsɪəs; -ʃəs; -ʃɪəs; ˈɡeɪ-/ adj
'gaseous' also found in these entries (note: many are not synonyms or translations):
aeriform
- air sac
- atmosphere
- biofuel
- butane
- chlorofluorocarbon
- chromosphere
- comet
- condense
- cyclopropane
- effluvium
- emanation
- -eous
- ethane
- ethylene
- gas
- Graham
- inert gas
- laser
- natural gas
- neon
- nitrogen
- oilgas
- oxygen
- pneumatophore
- propane
- propene
- saturated
- star
- sun
- vapour
- vaporize
- vinyl chloride
- water vapour
- actinon
- ammonia
- argon
- blackleg
- bleaching powder
- boil
- butylene
- char
- chlorofluoromethane
- colloid
- condensed
- critical point
- critical volume
- electrode
- electronics
- ethylene oxide