noun
1. : any of various reeds or reedy grasses: as
a. : a tall perennial grass of the genus Calamagrostis sometimes used for hay ; especially : an Australian grass ( C. quadriseta or Deyeuxia quadriseta )
b. : a grass of the genus Arundo ; especially : giant reed 1
c. : wood grass 1
d. : a grass of the genus Phragmites ; especially : ditch reed
2. : bur reed