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


sea urchin

BrE BrE//ˈsiː ɜːtʃɪn//
; NAmE NAmE//ˈsiː ɜːrtʃɪn//
(also urchin) Invertebrates
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a small sea creature with a round shell which is covered with spikes See related entries: Invertebrates
See the Oxford Advanced American Dictionary entry: sea urchin