floating fern

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. 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
• Hypernyms:
aquatic fern, water fern
• Member Holonyms:
Azolla, genus Azolla
2. aquatic fern of tropical America often used in aquariums
• Syn:
water sprite, Ceratopteris pteridioides
• Hypernyms:
aquatic fern, water fern
• Member Holonyms:
Ceratopteris, genus Ceratopteris
3. pantropical aquatic fern
• Syn:
Ceratopteris thalictroides
• Hypernyms:
aquatic fern, water fern
• Member Holonyms:
Ceratopteris, genus Ceratopteris