noun

any of the flat appendages growing from a bird’s skin and forming its plumage, consisting of a partly hollow horny shaft fringed with vanes of barbs.

the waxwing has very bright feathers and a prominent crest

plume,quill,plumage,feathering,down,eider (down),hackles,crest,tuft,topknot,pinion,covert,remex,rectrix,plumule,semi-plume,vibrissae,flag

verb

rotate the blades of (a propeller) about their own axes in such a way as to lessen the air or water resistance.