a supplementary feather, usually small, arising from the underside of the base of the of certain feathers in many birds.
the of such a feather.
Historical Examples

Only in the cassowary and emu among adult birds is the aftershaft as large as the main shaft.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 2 Various

(ornithol) a secondary feather arising near the base of a contour feather


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