Pronunciation: /ˈʌɪəs/
noun (plural eyasses)
A young hawk, especially (in falconry) an unfledged nestling taken from the nest for training.
Origin
Late 15th century (originally nyas): from French niais, based on Latin nidus 'nest'. The initial n was lost by wrong division of a nyas; compare with adder1.

via Conserve Wildlife Foundation of NJ
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Mark carefully handled his most recent eyas. Slow, careful motions and frequent treats were useful in getting the young hawk used to his presence. Trust between handler and bird was critical.