Added 9 October 2026 gaseous /ˈɡæsiəs/ adjective Categories: Describing WordsUncommon Words adjective ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about gaseous at Wordnik → Where our words come from → Relating to, or existing as gas (matter in an intermediate state between liquid and plasma). gaseous state Of a liquid containing bubbles: gassy. Lacking substance or solidity; tenuous. Her gaseous explanations left everyone confused. Related Words: gasifiedvaporificairlikevaporishvapourousvapourishaerosolizedvaporousaeriformfoamyfrothygassy Back to today's word