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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
Purple sea urchin populations have exploded in Oregon in recent years after a die-off of another of the shellfishes' top predators — sunflower sea stars.
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Kale Williams, Axios, 29 Jan. 2025
Uni, or sea urchin, is a celebrated delicacy at sushi restaurants.
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Akiko Katayama, Forbes, 30 Dec. 2024
Inspired by the sea urchin designs conceived by Genta during a 1994 vacation in Corsica, the timepiece embodies creativity and elegance.
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Cassell Ferere, Forbes, 22 Jan. 2025
Tucked between these charismatic creatures are a multitude of sea urchins in various stages of life.
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Lisa S. Gardiner, Smithsonian Magazine, 7 Aug. 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 19 Feb. 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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