Azolla(redirected from Duckweed fern)
Also found in: Thesaurus.
(Plants) a genus of fern growing in tropical waters
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|Noun||1.||Azolla - a genus of fern sometimes placed in its own family Azollaceae|
Azolla caroliniana, Carolina pond fern, mosquito fern, floating fern - small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
fern genus - genera of ferns and fern allies