| Noun | 1. | Zannichelliaceae - alternative classification for some genera included in Potamogetonaceae; one species liliopsid family, monocot family - family of flowering plants having a single cotyledon (embryonic leaf) in the seed Alismales, Naiadales, order Alismales, order Naiadales - an order of aquatic monocotyledonous herbaceous plants genus Zannichellia, Zannichellia - horned pondweed: completely submerged herbs; in some classifications included in Potamogetonaceae |