one of the tail feathers of a bird controlling direction during flight.
- rec·tri·cial [rek-trish-uhl], /rɛkˈtrɪʃ əl/, adjective
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How to use rectrix in a sentence
rectrix, rek′triks, n. one of the long tail-feathers of a bird, so called because used in steering the bird in its flight:—pl.
The exterior rectrix is entirely black; the second has a clear brown stripe on the inside border.Argentine Ornithology, Volume II (of 2) | P. L. Sclater
The outermost rectrix of No. 31633 is wholly white; the second rectrix is nearly as white.Birds from Coahuila, Mexico | Emil K. Urban
British Dictionary definitions for rectrix
any of the large stiff feathers of a bird's tail, used in controlling the direction of flight
- rectricial (rɛkˈtrɪʃəl), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012