1. Plural of bitterweed; any of various plants with a bitter taste, especially those of the genus Ambrosia or Helenium, often considered weeds.
Usage: Usually used in plural form; Common in North America; Often refers to plants that are toxic to livestock

Examples

• The pasture was overgrown with bitterweeds that made the milk taste unpleasant.
• Farmers work to remove bitterweeds from their fields each season.
• Cattle avoid eating bitterweeds because of their unpleasant flavor.
• The bitterweeds spread rapidly across the neglected land.
• Bitterweeds can poison livestock if consumed in large quantities.