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Previous word: echinoderm
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Definition of: echinoid
(i·kī′noid) noun
Any of a class (Echinoidea) of echinoderms, including sea urchins, sand dollars, etc.
—adjective Echiniform.
—ech·i·noi·de·an (ek′i·noi′dē·ən) adjective & noun
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