sea urchin
noun
any echinoderm of the class Echinoidea, having a somewhat globular or discoid form, and a shell composed of many calcareous plates covered with projecting spines.
sea urchins
-
pluralof sea urchin.plural
The grammatical form denoting more than one person, place, thing, or idea.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The survivors, along with fish and echinoderms such as starfish and sea urchins, went on to dominate Earth's oceans, a pattern that continues today.
From Science Daily ● Jul. 12, 2026
"In the supermarket, you find luxury products, sea urchins or Dom Perignon champagne, and vegetables have become extremely expensive," pushing some people to do their shopping in a neighbouring town.
From Barron's ● Mar. 20, 2026
But tuna was not the only catch on offer on Sunday, with Hokkaido sea urchins also fetching a record-breaking 7m yen according to the Japan Times.
From BBC ● Jan. 5, 2025
A success at Scripps in San Diego means scientists can run experiments on painted sea urchins, potentially unlocking new discoveries in biology.
From Los Angeles Times ● Jun. 17, 2024
The robot plucked sea stars and sea urchins and sea snails from the water and dropped them into rock pools along the shore.
From "The Wild Robot Protects" by Peter Brown
