The nest of an eagle or other bird of prey, usually built on a high cliff or tree; also used figuratively for a high, isolated place.
From Old French 'aire' (nest), possibly influenced by Middle English 'eyre' (aerie), the term evolved to mean an eagle's nest and has remained largely unchanged in meaning since the 1400s.
An eagle's 'eyrie' is so high and isolated that the word became a metaphor for unreachable places—you might describe a penthouse or mountain retreat as an eyrie, borrowing the eagle's power!
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