Rectrices



noun, plural rectrices
[rek-trahy-seez, rek-truh-seez] /rɛkˈtraɪ siz, ˈrɛk trəˌsiz/ (Show IPA). Ornithology.
1.
one of the tail feathers of a bird controlling direction during flight.
noun (pl) rectrices (ˈrɛktrɪˌsiːz; rɛkˈtraɪsiːz)
1.
any of the large stiff feathers of a bird’s tail, used in controlling the direction of flight

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