rectrix

/rek-triks/US // ˈrɛk trɪks //UK // (ˈrɛktrɪks) //

矩形矩阵,矩形体,直线,矩阵

Definitions

n.名词 noun

1
plural rec·tri·ces [rek-trahy-seez, rek-truh-seez]. /rɛkˈtraɪ siz, ˈrɛk trəˌsiz/. Ornithology.
- : one of the tail feathers of a bird controlling direction during flight.

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.
The outermost rectrix of No. 31633 is wholly white; the second rectrix is nearly as white.