any of various small stemless aquatic plants of the family Lemnaceae, esp any of the genus Lemna, that have rounded leaves and occur floating on still water in temperate regions
WordReference Random House Unabridged Dictionary of American English © 2025
duck•weed
(duk′wēd′),USA pronunciation n.
- Plant Biologyany plant of the family Lemnaceae, esp. of the genus Lemna, comprising small aquatic plants that float free on still water.
- 1400–50; late Middle English dockewede; so called because eaten by ducks
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