nutgrass
WordNet
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(n)
nutgrass
a widely distributed perennial sedge having small edible nutlike tubers
Webster's Revised Unabridged Dictionary
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nutgrass
(Bot) A widely distributed perennial plant of the Sedge family (Cyperus rotundus, var. Hydra), which has slender rootstocks bearing small, edible, nutlike tubers, by which the plant multiplies exceedingly, especially in cotton fields.
Usage in the news
How can I get rid of nutgrass in my yard. onlineathens.com
Avoid tilling purslane, bindweed, nutgrass, crabgrass, and johnsongrass. gardeningclub.com