noun, plural rectrices [rek-trahy-seez, rek-truh-seez] . Ornithology.
one of the tail feathers of a bird controlling direction during flight.

1605–15; < Latin rēctrīx, feminine of rēctor rector

rectricial [rek-trish-uhl] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rectrix (ˈrɛktrɪks)
n , pl rectrices
any of the large stiff feathers of a bird's tail, used in controlling the direction of flight
[C17: from Late Latin, feminine of rector governor, rector]

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