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pond scum
noun
- any free-floating freshwater alga that forms a green scum on water.
pond scum
noun
- a greenish layer floating on the surface of stagnant waters, consisting of various freshwater algae
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Word History and Origins
Origin of pond scum1
First recorded in 1885–90
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Example Sentences
So they placed the air sampler on the shore of a small pond during a bloom of pond scum.
His group knew the pond scum responsible could release toxins that might enter the air.
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