a young hawk, especially (in falconry) an unfledged nestling taken from the nest for training
（尤指供猎鹰训练用的）雏鹰。
词源
late 15th cent. （originally nyas ）： from French niais, based on Latin nidus 'nest'. The initial n was lost by wrong division of a nyas; compare with ADDER1, APRON, and UMPIRE.