Etymology
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ornithopter (n.)

1908, from French ornithoptère (1908), a machine designed to fly by mechanical flapping of wings, from ornitho- + Greek pteron "wing" (from PIE root *pet- "to rush, to fly"). A mode of flight considered promising at least since Leonardo's day.

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Definitions of ornithopter

ornithopter (n.)
heavier-than-air craft that is propelled by the flapping of wings;
Synonyms: orthopter
From wordnet.princeton.edu