1. having or covered with or abounding in plumes - the plumed serpent - white-plumed egrets • Syn: plumy • Similar to: feathered 2. having an ornamental plume or feathery tuft • Syn: plumate, plumose • Similar to: feathered • Topics: biology, biological science 3.(of a knight's helmet) having a decorative plume • Syn: crested • Similar to: adorned, decorated