Used attributively before another noun in a relational sense (e.g., "waterweed control").
Definitions
waterweednoun
Any submerged freshwater aquatic plant, especially species of the genus Elodea, that grows entirely or mostly under water in ponds, lakes, and slow-moving streams.
The pond was choked with waterweed, making it difficult for the fish to swim freely.
waterweedadjective
Relating to, consisting of, or intended for waterweed.