1. any of various aquatic plants that grow submerged or floating in ponds, lakes, and slow-moving water

Examples

• The pond was covered with thick mats of pondweed.
• Fish often hide among the pondweed for protection.
• The biologist collected samples of pondweed to study.
• Ducks feed on the seeds and shoots of pondweed.
• The clear water allowed us to see the pondweed growing on the bottom.
• Gardeners sometimes plant pondweed to oxygenate their water features.