Definition of wire grass
: any of various grasses or rushes having wiry culms or leaves: such asa : a Eurasian slender-stemmed meadow grass (Poa compressa) widely naturalized in the U.S. and Canadab : any of several coarse grasses (genus Aristida) with a 3-awned lemma that grow extensively in open dry, sandy, or sterile areas especially of the southeastern and south-central U.S.
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