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Adj.1.vapourific - (used of substances) capable of being volatilized
volatile - evaporating readily at normal temperatures and pressures; "volatile oils"; "volatile solvents"
2.vapourific - resembling or characteristic of vaporvapourific - resembling or characteristic of vapor; "vaporous clouds"
gaseous - existing as or having characteristics of a gas; "steam is water is the gaseous state"