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.
Definition of knotgrass in:
- The US English dictionary