noun
: any of various grasses or sedges that typically grow in tussocks: as
a. : a tall stout cespitose grass ( Poa flabellata ) valuable for fodder introduced into Scotland from the Falkland islands
b. : an Australian grass ( Poa caespitosa )
c. : smut grass
d. : great bulrush
e. : a sedge that forms dense tufts in wet meadows or boglands ; especially : tussock sedge