purple nutsedge

noun

variants or less commonly purple nut grass

: nut grass sense 1a

Cyperus rotundus, commonly known as purple nutsedge or nutgrass, is considered one of the world's worst invasive weeds.

—Ranjodh Singh, The New York Times, 19 Aug. 2014

Word History

First Known Use

1988, in the meaning defined above

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