pond scum

noun

Definition of pond scum 

1 : any of various algae (especially spirogyra) or cyanobacteria

2 : a mass of tangled filaments of algae or cyanobacteria in stagnant waters

Examples of pond scum in a Sentence

Recent Examples on the Web

The idea behind the venture was radical: Use synthetic biology, a promising new technology that lets scientists reengineer the genetics of living organisms, to take on the fossil-fuel industry—and do the whole thing with pond scum. David Ferry, Newsweek, "The Promises and Perils of Synthetic Biology," 11 Mar. 2015

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'pond scum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of pond scum

1864, in the meaning defined at sense 1

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The first known use of pond scum was in 1864

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Britannica.com: Encyclopedia article about pond scum

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