feather boa

noun2

1. •
   A boa (“type of long scarf, usually worn by being draped across the shoulders with the ends hanging low, sometimes also with a loop around the neck”) made of feathers, either real or synthetic.
2. •
   In full feather boa kelp: Egregia menziesii, a lessoniaceous kelp found in intertidal water along the western coastline of North America.