duckweed

[duhk-weed]
noun
any plant of the family Lemnaceae, especially of the genus Lemna, comprising small aquatic plants that float free on still water.

Origin:
1400–50; late Middle English dockewede; so called because eaten by ducks

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World English Dictionary
duckweed (ˈdʌkˌwiːd)
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The duckweed method is convenient to use and provides an additional sediment toxicity indicator.
Big duckweed, small duckweed, and watermeal are found over much of the surface area.
The first aquaculture pond will produce aquatic plants, initially duckweed, for extraction of nutrients.
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