■ noun
1》 a long, soft feather or arrangement of feathers used by a bird for display, or worn on a hat or helmet as decoration.
2》 a long spreading cloud of smoke or vapour.
3》 Geology a column of magma rising by convection in the earth's mantle.
■ verb
1》 [often as adjective ~d ] decorate with or as if with feathers.
↘spread out in a shape resembling a feather.
2》 ( ~ oneself ) chiefly archaic (of a bird) preen.
↘feel a great sense of self-satisfaction.
Derivatives
~less adjective
Origin
ME: from OFr., from L. pluma 'down'.