Hypertext Webster Gateway: "Duckweed"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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}.
From WordNet (r) 1.7 (wn)
duckweed
n : any small or minute aquatic plant of the family Lemnaceae
that float on or near the surface of shallow ponds
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