Definition of waterweed in US English:



  • 1Any aquatic plant with inconspicuous flowers, especially a pondweed.

    • ‘One had tresses of green waterweed hanging in her eyes.’
    • ‘I grimaced, I hated pickled waterweed, and by the face mother pulled when she ate it, I suspect she did too.’
    • ‘He sat on the rock, undulating like a waterweed, brie in one hand, knife in the other.’
  • 2A submerged aquatic American plant that is grown in aquariums and ornamental ponds.

    Genus Elodea, family Hydrocharitaceae: several species, in particular E. canadensis

    • ‘Be sure to include submergent plants such as common waterweed and hornwort for their high oxygen output.’