RECTRIX
Rec "trix (-trks ), n.; pl. Rectrices (-tr. Etym: [L., fem. of rector. ]
rectrix
rec trix |ˈrekˌtriks ˈrɛktrɪks | ▶noun ( pl. rectrices |-ˌtrəsēz | ) Ornithology any of the larger feathers in a bird's tail, used for steering in flight. Compare with remex. ORIGIN mid 18th cent.: from Latin, feminine singular of rector ‘ruler, governor ’ (see rector ).