| zannichellia | (n) horned pondweed: completely submerged herbs; in some classifications included in Potamogetonaceae, Syn. genus Zannichellia |
| zannichelliaceae | (n) alternative classification for some genera included in Potamogetonaceae; one species, Syn. family Zannichelliaceae |
| horned pondweed | (n) found in still or slow-moving fresh or brackish water; useful to oxygenate cool water ponds and aquaria, Syn. Zannichellia palustris |