n. Plumage.n. The adjustment of feathers to an arrow, whether shaft or bolt. See arrow, vireton.n. In architecture, an arrangement of small arcs or foils separated by projecting points or cusps, used as ornaments in the molding of arches, etc., in pointed medieval architecture; foliation. See cusp.n. Same as feather, 2 .n. In the aquatint process, the application of strong acid to the plate, to bite in dark touches. See aquatint.n. In violin-playing, a very light and delicate use of the bow.