flight feather

noun Ornithology.
one of the large, stiff feathers of the wing and tail of a bird that are essential to flight.


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World English Dictionary
flight feather
any of the large stiff feathers that cover the wings and tail of a bird and are adapted for flying

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Have students sketch a whooping crane flight feather and label the quill, barbs and barbules.
Emargination: a distinct narrowing in the anterior vane of a primary flight feather.
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