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knot·grass | \ ˈnät-ˌgras 
\
\Definition of knotgrass
1 : a cosmopolitan prostrate weed (Polygonum aviculare) of the buckwheat family with jointed stems, prominent sheathing stipules, and minute flowers broadly : any of several congeneric plants
2 : any of several grasses (such as Paspalum distichum) with markedly jointed stems
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The first known use of knotgrass was in 1538
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