Definitions of plume:

• noun:   a feather or cluster of feathers worn as an ornament
• noun:   the light horny waterproof structure forming the external covering of birds
• verb:   form a plume
• verb:   deck with a plume

  Example: "A plumed helmet"

• verb:   clean with one's bill
• verb:   be proud of
• verb:   dress or groom with elaborate care
• verb:   rip off; ask an unreasonable price
• name:  A surname (very rare: popularity rank in the U.S.: #54882)