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, ↑Azolla caroliniana
• Hypernyms: ↑aquatic fern, ↑water fern
• Member Holonyms: ↑Azolla, ↑genus Azolla
Useful english dictionary. 2012.