rectrix

One of the stiff main feathers of a bird's tail, used to stabilize the bird while in flight and to control its direction.

Same as rectoress.

In ornithology, a tail-feather; one of the long or large quill-feathers of a bird's tail: so called from its use in directing or steering the course of a bird in flight, like a rudder.

A governess; a rectoress.

One of the quill feathers of the tail of a bird.