Resembling air or having the form of air.

synoniem: airlike.

Characterized by lightness and insubstantiality; as impalpable or intangible as air:
— Figures light and aeriform come unlooked for and melt away.

synoniemen: aerial, aery, airy, ethereal.

Roget 334: gaseous, aeriform^†, ethereal, aerial, airy, vaporous, volatile, evaporable^†, flatulent.   

Roget 338: containing air, flatulent, effervescent; windy etc. 349.    atmospheric, airy; aerial, aeriform^†; meteorological; weatherwise^†.