Definition of beard grass
1 : a grass of the genus Polypogon (especially P. monspeliensis) with a densely bearded spike
2 : any of several common grasses of the genus Andropogon (such as A. scoparius)
3 : needlegrass 2
4 : any perennial grass of the genus Gymnopogon (family Gramineae) with short rigid leaves and numerous slender flower spikes
5 : plume grass 1
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