Sea Urchin Definition

noun
Any of various orders of echinoid echinoderms having a somewhat globular body of fused skeletal plates studded with long, calcareous, movable spines.
Webster's New World
Attributive form of sea urchin.
Sea-urchin look.
Wiktionary
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Other Word Forms of Sea Urchin

Noun

Singular:
sea urchin
Plural:
sea-urchins

Origin of Sea Urchin

  • From sea + urchin (“hedgehog"). reflecting a similarity in appearance to the hedgehog.

    From Wiktionary

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sea urchin