ˈpulviplumeOrnith. [ad.mod.L. pulviplūma, f. L. pulvi-s dust + plūma plume, feather.] Powder-down. 1890Coues Field & Gen.Ornithol. 129 Such plumulæ, from being always dusted over with dry scurfy exfoliation, are called powder-down... I call them pulviplumes.