GASEOUS
gaseous
(adjective) existing as or having characteristics of a gas; “steam is water is the gaseous state”
Source: WordNet® 3.1
Etymology
Adjective
gaseous (comparative more gaseous, superlative most gaseous)
Relating to, or existing as, gas.
Of a liquid containing bubbles: gassy.
Tenuous or indefinite.
Source: Wiktionary
Gas"e*ous ( or ; 277), a. Etym: [From Gas. Cf. F. gazeux.]
1. In the form, or of the nature, of gas, or of an aëriform fluid.
2. Lacking substance or solidity; tenuous. "Unconnected, gaseous
information." Sir J. Stephen.
Source: Webster’s Unabridged Dictionary 1913 Edition