Adjective: aeriform 'eh-ru,form
- Resembling air or having the form of air
"The aeriform consistency of the foam made it an excellent insulator";
- airlike
- Characterized by lightness and insubstantiality; as impalpable or intangible as air
"figures light and aeriform come unlooked for and melt away";
- aerial, airy, aery, ethereal, etherial
See also: gaseous, insubstantial, unreal, unsubstantial