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riverweed

[riv-er-weed] /ˈrɪv ərˌwid/
noun
1.
any of several chiefly tropical submerged aquatic plants of the genus Podostemum and related genera, growing in rapidly moving streams.
Origin
1665-1675
1665-75; river1 + weed1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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