Definition of knotgrass in English:

knotgrass

Syllabification: knot·grass
Pronunciation: /ˈnätɡras
 
/

noun

1A common Eurasian plant of the dock family, with jointed creeping stems and small pink flowers. It is a serious weed in some areas.
  • Genus Polygonum, family Polygonaceae: several species, in particular P. aviculare
More example sentences
  • The main weeds dying back were creeping thistle, couch and mature knotgrass.
1.1Any of a number of other plants, especially grasses, with jointed stems.

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit