The Collaborative International Dictionary
Rectrix
Rectrix \Rec"trix\ (-tr?ks), n.; pl. Rectrices (-tr?"s?z).
A governess; a rectoress.
(Zo["o]l.) One of the quill feathers of the tail of a bird.
Wiktionary
rectrix
n. 1 A governess; a rectoress. 2 A flight feather on the tails of birds, used for directional control.