pondweed

[ pond-weed ]
/ ˈpɒndˌwid /
|

noun

any aquatic plant of the genus Potamogeton, most species of which grow in ponds and quiet streams.

Origin of pondweed

First recorded in 1570–80; pond + weed1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for pondweed

pondweed

/ (ˈpɒndˌwiːd) /

noun

any of various water plants of the genus Potamogeton, which grow in ponds and slow streams: family Potamogetonaceae
Also called: waterweed British any of various unrelated water plants, such as Canadian pondweed, mare's-tail, and water milfoil, that have thin or much divided leaves
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012