rectrix


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rectrix

(rĕk′trĭks)
n. pl. rectrices (rĕk′trĭ-sēz′, rĕk-trī′sēz)
One of the stiff main feathers of a bird's tail, used to stabilize the bird while in flight and to control its direction.

rectrix

(pl. retrices) see FEATHER.