noun
1. : any of several aquatic ferns of the genus Ceratopteris (especially C. thalictroides and C. pteridoides ) often used in aquariums — called also water sprite
2. : floating moss ; also : a related plant ( Azolla caroliniana )
noun
1. : any of several aquatic ferns of the genus Ceratopteris (especially C. thalictroides and C. pteridoides ) often used in aquariums — called also water sprite
2. : floating moss ; also : a related plant ( Azolla caroliniana )
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012