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pond scum

noun

  1. any free-floating freshwater alga that forms a green scum on water.


pond scum

noun

  1. a greenish layer floating on the surface of stagnant waters, consisting of various freshwater algae
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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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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