Definition: pondweed

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Source: WordNet (r) 1.7 

pondweed
     n 1: any of several submerged or floating freshwater perennial
          aquatic weeds belonging to the family Potamogetonaceae
     2: submerged freshwater perennials [syn: Elodea, genus
        Elodea, ditchmoss]

Source: Webster's Revised Unabridged Dictionary (1913) 

Pondweed \Pond"weed`\, n. (Bot.)
   Any aquatic plant of the genus Potamogeton, of which many
   species are found in ponds or slow-moving rivers.

   Choke pondweed, an American water weed (Anarcharis, or
      Elodea, Canadensis.) See Anacharis.

   Horned pondweed, the Zannichellia palustris, a slender,
      branching aquatic plant, having pointed nutlets.