aeriform

adj. airy in form, gaseous; insubstantial

Adjective
1. resembling air or having the form of air
(synonym) airlike
(similar) gaseous
2. characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle; "aerial fancies"; "an airy apparition"; "physical rather than ethereal forms"
(synonym) aerial, airy, aery, ethereal
(similar) insubstantial, unsubstantial, unreal

(a.)
Having the form or nature of air, or of an elastic fluid; gaseous. Hence fig.: Unreal.
  

Aeriform Having the form or nature of air; used by Blavatsky to describe one of seven fundamental transformations of the constituent particles of matter of the globes (SD 1:205). Also used to describe primeval man on this earth during the fourth round, who was aeriform, devoid of compactness, and mindless (SD 2:80).

aeriform