| Noun | 1. | pondweed family - plants that grow in ponds and slow streams; sometimes includes family Zosteraceae 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 pondweed - any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae genus Potamogeton, Potamogeton - a large genus of aquatic herbs found in quiet waters in temperate regions; leaves usually float on the water genus Groenlandia, Groenlandia - a monocotyledonous genus of the family Potamogetonaceae genus Zostera, Zostera - (or in some classifications family Zosteraceae) small genus of widely distributed marine plants |