black butt, noun phrase
?Obsolete, Ostrich-farming A feather with a black butt-end, taken from between the tail and the tail covert of a cock ostrich. Cf. black noun sense 2. See also tail.
1909 J.E. Duerden in Agric. Jrnl of Cape of G.H. XXXIV. 524The feathers intermediate between the tails and tail coverts are known as Tails, Black Butts (B.B.).
A feather with a black butt-end, taken from between the tail and the tail covert of a cock ostrich.
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