pond weed

pondweed

[pond-weed]
noun
any aquatic plant of the genus Potamogeton, most species of which grow in ponds and quiet streams.

Origin:
1570–80; pond + weed1

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World English Dictionary
pondweed (ˈpɒndˌwiːd)
 
n
1.  any of various water plants of the genus Potamogeton, which grow in ponds and slow streams: family Potamogetonaceae
2.  (Brit) Also called: waterweed any of various unrelated water plants, such as Canadian pondweed, mare's-tail, and water milfoil, that have thin or much divided leaves

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