Meaning of river weed in English:

river weed

Pronunciation /ˈrɪvə ˌwiːd/

noun

  • 1An alga or flowering plant that grows in rivers.

  • 2North American Any plant of the genus Podostemum or (more widely) the family Podostemaceae; especially the threadfoot, P. ceratophyllum.

Origin

Mid 17th century; earliest use found in Thomas Johnson (d. 1644), apothecary and soldier. From river + weed.