Definition of gaseous adjective from the Oxford Advanced Learner's Dictionary

 

gaseous

 adjective
adjective
BrE BrE//ˈɡæsiəs//
 
; NAmE NAmE//ˈɡæsiəs//
 
; BrE BrE//ˈɡeɪsiəs//
 
; NAmE NAmE//ˈɡeɪsiəs//
 
[usually before noun]
 
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like or containing gas a gaseous mixture in gaseous form
See the Oxford Advanced American Dictionary entry: gaseous