
1) Aquatic plant 2) Hydrophyte 3) Hydrophytic plant 4) Water plant
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https://www.crosswordclues.com/clue/duckweed

1) Bog mat 2) Watermeal
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https://www.crosswordclues.com/clue/duckweed

• (n.) A genus (Lemna) of small plants, seen floating in great quantity on the surface of stagnant pools fresh water, and supposed to furnish food for ducks; -- called also duckmeat.
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http://thinkexist.com/dictionary/meaning/duckweed/

(Lemna) These aquatic plants are found all over the world. L. minor, known as Duckweed, is a tiny plant that floats on top of the water. It produces light green leaves, which have only a single root. Duckweed spreads rapidly and if not controlled will become a nuisance. This plant is eaten by fish and waterfowl, which help to keep its rapid growth ...
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http://www.encyclo.co.uk/local/10004
Duck'weed` noun (Botany) A genus (
Lemna ) of small plants, seen floating in great quantity on the surface of stagnant pools fresh water, and supposed to furnish food for ducks; -- called also
duckmeat .
Found on
http://www.encyclo.co.uk/webster/D/128

Duckweed is the popular name of several species of plants of the genus Lemna, natural order Lemnaceae. The plants grow in ditches and shallow water, floating on the surface, and serving for food for ducks and geese. Five species are known in Britain, and others are common in America. They consist of small fronds bearing naked unisexual flowers. Com...
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http://www.probertencyclopaedia.com/browse/BD.HTM

[
n] - any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
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http://www.webdictionary.co.uk/definition.php?query=duckweed
noun any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
Found on
https://www.encyclo.co.uk/local/20974

Any of a family of tiny plants found floating on the surface of still water throughout most of the world, except the polar regions and tropics. Each plant consists of a flat, circular, leaflike structure 0.4 cm/0.15 in or less across, with a single thin root up to 15 cm/6 in long below. (Genus chiefly
Lemna, family Lemnac...
Found on
https://www.encyclo.co.uk/local/21221

any plant of the family Lemnaceae, esp. of the genus Lemna, comprising small aquatic plants that float free on still water.
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https://www.infoplease.com/dictionary/duckweed
No exact match found.