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Adjective: aeriform  'eh-ru,form
  1. Resembling air or having the form of air
    - airlike
  2. 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

Encyclopedia: Aeriform