Wreath

Merriam-Webster Online Dictionary
wreath (noun)
1.
something intertwined or arranged in a circular shape as
a) a band of intertwined flowers or leaves worn as a mark of honor or victory - garland a laurel wreath
b) a decorative arrangement of foliage or flowers on a circular base - a Christmas wreath
2.
something having a circular or coiling form - a wreath of smoke