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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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 Canadensis, syn. Elodea Canadensis.) See Anacharis.
 Horned pondweed, the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.
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From: WordNet (r) 2.0

 horned pondweed
      n : found in still or slow-moving fresh or brackish water;
          useful to oxygenate cool water ponds and aquaria [syn: Zannichellia
           palustris]