echinoderm
noun [ C ] biology specialized uk/ekˈaɪ.nəʊ.dɜːm/ us/ɪˈkaɪ.noʊ.dɝːm/
棘皮动物（一种海洋生物，表皮有凸起或棘刺，身体呈五辐对称形）
a type of sea creature with raised areas or sharp points on its skin and a body made of five equal parts arranged around the centre
Echinoderms like the starfish live on the sea floor. 像海星这样的棘皮动物生活在海底。