资料来源 : pyDict

水萍

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Duckweed \Duck"weed`\, n. (Bot.)
   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}.

资料来源 : WordNet®

duckweed
     n : any small or minute aquatic plant of the family Lemnaceae
         that float on or near the surface of shallow ponds