1. [ noun ] (botany) aquatic fern of tropical America often used in aquariums
Synonyms: Ceratopteris_pteridioides water_sprite
Related terms: aquatic_fern Ceratopteris
2. [ noun ] (botany) pantropical aquatic fern
Synonyms: Ceratopteris_thalictroides
Related terms: aquatic_fern Ceratopteris
3. [ noun ] (botany) small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe
Synonyms: Carolina_pond_fern Azolla_caroliniana mosquito_fern
Related terms: aquatic_fern Azolla
Similar spelling:   floating_voter