Noun
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any habitation at a high altitude
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the lofty nest of a bird of prey (such as a hawk or eagle)
Adjective
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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"