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echinoid

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e⋅chi⋅noid

  [i-kahy-noid, ek-uh-noid]
Use echinoid in a Sentence
–adjective
1. belonging or pertaining to the class Echinoidea, comprising mainly sea urchins and sand dollars.
–noun
2. any echinoderm of the Echinoidea.
Origin:
1850–55; < NL Echinoidea; see echinus, -oidea
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·chi·noid   (ĭ-kī'noid')   
n.  An echinoderm of the class Echinoidea, which includes the sand dollars and sea urchins.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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