| Noun | 1. | subfamily Cabombaceae - in some classifications considered an independent family of water lilies; comprises the genera Cabomba and Brasenia magnoliid dicot family - family of dicotyledonous flowering plants regarded as among the most primitive of extant angiosperms Cabomba, genus Cabomba - alternatively, a member of the family Nymphaeaceae; a small genus of American aquatic plants Brasenia, genus Brasenia - alternatively, a member of the family Nymphaeaceae |