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[ih-kahy-noid, ek-uh-noid] /ɪˈkaɪ nɔɪd, ˈɛk əˌnɔɪd/

belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars.
any echinoderm of the Echinoidea.
/ɪˈkaɪnɔɪd; ˈɛkə-/
any of the echinoderms constituting the class Echinoidea, typically having a rigid ovoid body. The class includes the sea urchins and sand dollars
of or belonging to this class


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  • Echinus

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  • Echiurid

    [ek-ee-yoo r-id] /ˌɛk iˈyʊər ɪd/ noun 1. any of various unsegmented marine worms of the phylum Echiura, comprising the spoonworms.

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