lemna : Idioms & Phrases
genus lemna
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noun minute aquatic herbs floating on or below the water surface of still water consisting of a leaflike frond or plant body and single root
Lemna.
WordNet
lemna minor
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noun of temperate regions except eastern Asia and Australia
common duckweed; lesser duckweed.
WordNet
lemna trisulca
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noun cosmopolitan in temperate regions except North America
star-duckweed.