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