Vent feather

(Zool.) one of the anal, or crissal, feathers of a bird.

See also: Vent

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
With their heavy feathering, Cochins sometimes need a vent feather trimming before the breeding season.
The consequence of the reduced cloacal sphincter function was persistent soiled vent feathers that the owner cleaned daily.