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sea urchin
noun
: any of numerous echinoderms (class Echinoidea) that are usually enclosed in thin brittle globular tests covered with movable spines
Examples of sea urchin in a Sentence
Recent Examples on the Web
My personality is Paleozoic: sea urchin, horn lantern with the panes of horn
left out.
—Max Ufberg, hazlitt.net, 10 Jan. 2025
Ago Bay is the heartland of Japan's legendary ama divers – generations of fearless women who, for thousands of years, have held their breath and plunged to the seabed in search of scallops, abalone, sea urchins and sea snails.
—Scott Campbell, theweek, 23 Dec. 2024
The crew also found cactus-like sea urchins and marine sponges that were as tall as humans.
—Scott Travers, Forbes, 14 Dec. 2024
Other algae grazers like sea urchins, meanwhile, have vanished, too.
—Benji Jones, Vox, 8 Oct. 2024
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Word History
First Known Use
1591, in the meaning defined above
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Cite this Entry
“Sea urchin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sea%20urchin. Accessed 23 Jan. 2025.
Kids Definition
sea urchin
noun
: any of a class of small marine invertebrate animals that are echinoderms, usually live on or burrow in the sea bottom, and are enclosed in roundish shells covered with spines that can move
More from Merriam-Webster on sea urchin
Nglish: Translation of sea urchin for Spanish Speakers
Britannica.com: Encyclopedia article about sea urchin
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