1A small aquatic or semiaquatic fern which is either free-floating or anchored by the roots, found chiefly in tropical and warm countries.
- Families Azollaceae, Marsileaceae and Salviniaceae: many species, in particular the minute floating Azolla filiculoides of tropical America, which has been naturalized elsewhere
More example sentences
- Genomic downsizing is suggested for the heterosporous water ferns and for the aquatic fern Ceratopteris.
- However, both water ferns and Selaginella are also heterosporous, unlike any other pteridophytes except Isoetales.
- Thick mass of Trapa, an economically important free floating plant called Singhari by the local people, besides water ferns, duckweeds etc can be seen almost everywhere.
Definition of water fern in:
- The US English dictionary