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nut grass

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noun
  1. either of two sedges, Cyperus rotundus or C. esculentus, that have small, nutlike tubers and are often troublesome weeds.
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Origin of nut grass

An Americanism dating back to 1765–75
Also called nut sedge.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018