1. (noun) pantropical aquatic fern

• ceratopteris thalictroides

2. (noun) aquatic fern of tropical America often used in aquariums

• ceratopteris pteridioides
• water sprite

3. (noun) small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe

• azolla caroliniana
• carolina pond fern
• mosquito fern

1. (noun) pantropical aquatic fern

• aquatic fern
• water fern

2. (noun) aquatic fern of tropical America often used in aquariums

• aquatic fern
• water fern

3. (noun) small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe

• aquatic fern
• water fern

1. (noun) pantropical aquatic fern

• ceratopteris
• genus ceratopteris

2. (noun) aquatic fern of tropical America often used in aquariums

• ceratopteris
• genus ceratopteris

3. (noun) small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe

• azolla
• genus azolla