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1. (n.) knotgrass
a common knotweed, Polygonum aviculare, with small leaves and dry fruit that are eaten by birds.
2. knotgrass
a widespread creeping grass, Paspalum distichum, that forms large mats in shallow waters and ditches.
Etymology: (1530–40)
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| Definition of 'knotgrass' |
Princeton's WordNet |
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1. (noun) knotgrass, Paspalum distichum
low-growing weedy grass with spikelets along the leaf stems
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| Definition of 'knotgrass' |
Webster Dictionary |
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1. (noun) knotgrass
a common weed with jointed stems (Polygonum aviculare); knotweed
2. (noun) knotgrass
the dog grass. See under Dog
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Definitions of knotgrass 
