- duckweed - any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds
--1 is a kind of aquatic plant, water plant, hydrophyte, hydrophytic plant
--1 is a member of Lemnaceae, family Lemnaceae, duckweed family
--1 has particulars:common duckweed, lesser duckweed, Lemna minor; star-duckweed, Lemna trisulca; great duckweed, water flaxseed, Spirodela polyrrhiza; watermeal; mud midget, bogmat, Wolffiella gladiata