knotgrass

noun 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

Recent Examples of knotgrass from the Web

This Series should play on a field of gout-wort, grommel and knotgrass.

— john hyduk, New York Times, "Cleveland Indians Fans Hope That Ghosts of Past Are Put to Rest," 24 Oct. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'knotgrass.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.