one of the paired, elongated, sickle-shaped, middle feathers of the tail of the rooster.
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Origin of sickle feather
First recorded in 1680–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for sickle feather
(often plural) any of the elongated tail feathers of certain birds, esp the domestic cock
Word Origin for sickle feather
C17: so called because of its shape
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