Rectrix
Pronunciation : Rec"trix (-trks)
Part of Speech : n.;
Etymology : [L., fem. of rector.]
Definition : 1. A governess; a rectoress.
2. (Zo?l.)
Defn: One of the quill feathers of the tail of a bird.
pl. Rectrices (-tr.
Source : Webster's Unabridged Dictionary, 1913