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a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds

a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds

a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds

(military) a temporary or supplementary fortification; typically square or polygonal without flanking defenses

functioning in a supporting capacity