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Multi-word Results
| pond lily |
see "water lily." |
| pond scum |
a mass of usu. green scum formed on the surface of stagnant water by freshwater algae, or the algae that form this mass. |
| solar pond |
a pond with a top layer of fresh water and a bottom layer of dense hot salty water, used to trap solar energy for use in heating or to generate electricity. |
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