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water flea
noun
: any of various small active dark or brightly colored aquatic crustaceans (such as a daphnia or cyclops)
Examples of water flea in a Sentence
Recent Examples on the Web
In 2019, the biologists finally arrived at the optimal formula of mysid shrimp, water fleas and blood worms.
—Alexander Nazaryan, New York Times, 9 May 2024
Birdseed and the plants that attract songbirds aren’t a big draw for waterfowl, as most prefer beetles, snails, water fleas and other insects found on the edges of lakes and ponds.
—Renee Elder, Charlotte Observer, 31 Jan. 2024
To test for some of the potential adverse effects of these plastics, the researchers exposed a model organism called a water flea, or Daphnia, to different concentrations of the microplastics leached from the tea bags.
—Anna Funk, Discover Magazine, 26 Sep. 2019
Not bad for a water flea.
—Andrew Moseman, Discover Magazine, 4 Feb. 2011
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Word History
First Known Use
1687, in the meaning defined above
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Cite this Entry
“Water flea.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/water%20flea. Accessed 5 Nov. 2024.
Kids Definition
water flea
noun
: any of various small active dark or brightly colored freshwater crustaceans (as a daphnia)
More from Merriam-Webster on water flea
Britannica.com: Encyclopedia article about water flea
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