| azolla | (n) a genus of fern sometimes placed in its own family Azollaceae, Syn. genus Azolla |
| azollaceae | (n) used in some classifications for the genus Azolla, Syn. family Azollaceae |
| mosquito fern | (n) small free-floating aquatic fern from the eastern United States to tropical America; naturalized in western and southern Europe, Syn. floating fern, Azolla caroliniana, Carolina pond fern |
| Azolla | n. a genus of ferns, someties placed in its own family |
| Azollaceae | n. a family designation used in some classifications for the genus |