the lofty nest of a bird of prey (such as a hawk or eagle)
any habitation at a high altitude
Adjective:
characterized by lightness and insubstantiality; as impalpable or intangible as air;
\\\"figures light and aeriform come unlooked for and melt away\\\"
\\\"aerial fancies\\\"
\\\"an airy apparition\\\"
\\\"physical rather than ethereal forms\\\"