1. Plural of knotgrass; any of various plants of the genus Polygonum or related genera, characterized by jointed stems and small flowers, commonly found in fields and waste areas.
Usage: Usually used in plural form; Common name for weedy plants

Examples

• The farmer pulled up knotgrasses from between the crop rows.
• Knotgrasses spread quickly across the neglected garden.
• These knotgrasses are difficult to remove because of their deep roots.
• The field was overgrown with various knotgrasses and other weeds.
• Livestock often avoid eating knotgrasses due to their bitter taste.