'floating fern' definitions:

Definition of 'floating fern'

(from WordNet)
noun
Pantropical aquatic fern [syn: floating fern, Ceratopteris thalictroides]
noun
Aquatic fern of tropical America often used in aquariums [syn: floating fern, water sprite, Ceratopteris pteridioides]
noun
Small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe [syn: mosquito fern, floating fern, Carolina pond fern, Azolla caroliniana]