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echinoid
e·chi·noid [ i k nòyd, ékə nòyd ] (plural e·chi·noids)


noun 
Definition:
 
ocean invertebrate: an invertebrate ocean animal with a hard ovoid body and movable spines. Sea urchins and sand dollars are echinoids. Class Echinoidea.

e·chi·noid adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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