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.
"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
Infected sea urchins became less active, moved in unusual ways, failed to respond to external stimuli, and eventually lost their flesh and spines before dying.
From Science Daily ● Dec. 12, 2025
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
They feed on small reef fishes, shrimps, octopuses, crabs, sea urchins and lobsters.
From Los Angeles Times ● Oct. 17, 2024
There were little pieces of ancient sea urchins in my hand, mollusk shells.
From "The Battle of the Labyrinth" by Rick Riordan
