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The Collaborative International Dictionary
Rectrix

Rectrix \Rec"trix\ (-tr?ks), n.; pl. Rectrices (-tr?"s?z).

  1. A governess; a rectoress.

  2. (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.