Based on the Random House Dictionary, © Random House, Inc. 2013.
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pondweed (ˈpɒndˌwiːd) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| 1. | any of various water plants of the genus Potamogeton, which grow in ponds and slow streams: family Potamogetonaceae |
| 2. | (Brit) Also called: waterweed any of various unrelated water plants, such as Canadian pondweed, mare's-tail, and water milfoil, that have thin or much divided leaves |
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| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
pondweed
any of several cosmopolitan freshwater plants sometimes grown in ponds or aquariums. They belong to two families: the Potamogetonaceae (pondwood family) and the Aponogetonaceae (lattice plant family), both of which have species that develop submerged or floating leaves but frequently have emergent flowering shoots. The former group includes frog's lettuce (Potamogeton densus), of Europe and southern Asia, and P. crispus, of Europe but naturalized in the eastern United States and in California. Cape pondweed (Aponogeton distachyus), of the family Aponogetonaceae, has several varieties grown for ornament in pools or greenhouses. Many species of these families serve as food for waterfowl and as cover for fishes
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