Pondweed
Pronunciation : Pond"weed`
Part of Speech : n.
Definition : Defn: 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.
(Bot.)
Source : Webster's Unabridged Dictionary, 1913