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FLOATING FERN

Definition:

[noun] pantropical aquatic fern
Synonyms: Ceratopteris thalictroides
[noun] aquatic fern of tropical America often used in aquariums
Synonyms: water sprite, Ceratopteris pteridioides
[noun] small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
Synonyms: mosquito fern, Carolina pond fern, Azolla caroliniana