AFTERSHAFT
\ˈaftəʃˌaft], \ˈaftəʃˌaft], \ˈa_f_t_ə_ʃ_ˌa_f_t]\
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A small tuft of down in the neighbourhood of the superior umbilicus in the feathers of most birds; in certain birds (e. g. moas, emu, cassowary) a second vane, which, usually shorter, but sometimes of equal length to the vane proper, arises near the superior umbilicus.
By Henderson, I. F.; Henderson, W. D.
