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Definition of sea urchin noun from the Oxford Advanced Learner's Dictionary

sea urchin

noun
 
/ˈsiː ɜːtʃɪn/
 
/ˈsiː ɜːrtʃɪn/
(also urchin)
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  1. a small sea creature with a round shell that is covered with spikesTopics Fish and shellfishc2
See sea urchin in the Oxford Advanced American Dictionary
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