Definition of reed grass
1 : any of various reeds or reedy grasses: such 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 : common reed
2 : bur reed
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