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Any of various small, free-floating, stemless aquatic flowering plants of the genus Lemna and several related genera, growing in dense colonies on the surface of quiet water.
(Plants) 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
any plant of the family Lemnaceae, esp. of the genus Lemna, comprising minute aquatic plants that float free on still water.
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|Noun||1.||duckweed - any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds|
common duckweed, Lemna minor, lesser duckweed - of temperate regions except eastern Asia and Australia
great duckweed, Spirodela polyrrhiza, water flaxseed - cosmopolitan except South America and New Zealand and some oceanic islands
watermeal - any of various aquatic plants of the genus Wolffia; throughout warmer regions of the world
bogmat, mud midget, Wolffiella gladiata - having narrow flat sickle-shaped submerged fronds; North America