Duckweed
[dʌkwi:d]
Definition
(noun.) any small or minute aquatic plant of the family Lemnaceae that float on or near the surface of shallow ponds.
Checked by Bernie--From WordNet
Definition
(n.) A genus (Lemna) of small plants, seen floating in great quantity on the surface of stagnant pools fresh water, and supposed to furnish food for ducks; -- called also duckmeat.
Checked by Calvin