Definition of sea urchin in English:

sea urchin

noun

A marine echinoderm having a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws.
Class Echinoidea
Example sentencesExamples
- The red sea urchin's body is domed above and flat below.
- This sea urchin defends itself with two sets of mobile spines.
- The inner shell of a sea urchin is a hollow globe, scored in five curved sections that taper at the ends into a small hole at the top and bottom.
- The sea urchin is one of the few marine organisms whose genome has been sequenced.
- The sea urchin occupies an important evolutionary position with respect to vertebrates and humans.

Definition of sea urchin in US English:

sea urchin

nounˈsi ˌərtʃənˈsē ˌərCHən

A marine echinoderm that has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Many species are harvested for food.
Class Echinoidea: several families and genera, and numerous species, including the Atlantic purple sea urchin (Arbacia punctulata, family Arbaciidae) and the green sea urchin (Strongylocentrotus drobachiensis, family Strongylocentrotidae)
Example sentencesExamples
- The inner shell of a sea urchin is a hollow globe, scored in five curved sections that taper at the ends into a small hole at the top and bottom.
- The red sea urchin's body is domed above and flat below.
- This sea urchin defends itself with two sets of mobile spines.
- The sea urchin occupies an important evolutionary position with respect to vertebrates and humans.
- The sea urchin is one of the few marine organisms whose genome has been sequenced.

单词	sea urchin
释义	Definition of sea urchin in English: sea urchin noun A marine echinoderm having a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Class Echinoidea Example sentencesExamples The red sea urchin's body is domed above and flat below. This sea urchin defends itself with two sets of mobile spines. The inner shell of a sea urchin is a hollow globe, scored in five curved sections that taper at the ends into a small hole at the top and bottom. The sea urchin is one of the few marine organisms whose genome has been sequenced. The sea urchin occupies an important evolutionary position with respect to vertebrates and humans. Definition of sea urchin in US English: sea urchin nounˈsi ˌərtʃənˈsē ˌərCHən A marine echinoderm that has a spherical or flattened shell covered in mobile spines, with a mouth on the underside and calcareous jaws. Many species are harvested for food. Class Echinoidea: several families and genera, and numerous species, including the Atlantic purple sea urchin (Arbacia punctulata, family Arbaciidae) and the green sea urchin (Strongylocentrotus drobachiensis, family Strongylocentrotidae) Example sentencesExamples The inner shell of a sea urchin is a hollow globe, scored in five curved sections that taper at the ends into a small hole at the top and bottom. The red sea urchin's body is domed above and flat below. This sea urchin defends itself with two sets of mobile spines. The sea urchin occupies an important evolutionary position with respect to vertebrates and humans. The sea urchin is one of the few marine organisms whose genome has been sequenced.
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