e·chi·noid ( -k  noid )n. An echinoderm of the class Echinoidea, which includes the sand dollars and sea urchins. |
echinoid [ɪˈkaɪnɔɪd ˈɛkə-]
n
(Life Sciences & Allied Applications / Animals) any of the echinoderms constituting the class Echinoidea, typically having a rigid ovoid body. The class includes the sea urchins and sand dollars
adj
(Life Sciences & Allied Applications / Animals) of or belonging to this class
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