Definitions

1. noun

a small aquatic plant (Lemna minor) that grows in dense green patches on the surface of ponds, lakes, and slow-moving streams, often forming a thick mat that can choke out other plant life.

“The gardener had to remove the duckweed from the pond before it spread to the nearby water garden.”

2. verb

to cover or overwhelm with a thick mat of duckweed

“The algal bloom duckweed-covered the entire surface of the lake, making it difficult to fish.”