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echinoderm

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e⋅chi⋅no⋅derm

[i-kahy-nuh-durm, ek-uh-nuh-]
–noun
any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea urchins, sea cucumbers, etc.

Origin:
1825–35; taken as sing. of NL Echinodermata, neut. pl. of echinodermatus < Gk echîn(os) sea urchin + -o- -o- + -dermatos -dermatous
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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e·chi·no·derm   (ĭ-kī'nə-dûrm')   
n.  Any of numerous radially symmetrical marine invertebrates of the phylum Echinodermata, which includes the starfishes, sea urchins, and sea cucumbers, having an internal calcareous skeleton and often covered with spines.

[From New Latin Echinodermata, phylum name : echino- + -dermata, -skinned (from Greek derma, dermat-, skin; see -derm).]
e·chi'no·der'mal, e·chi'no·der'ma·tous (-dûr'mə-təs) adj.
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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Word Origin & History

echinoderm 
1835, from Mod.L. Echinodermata, from Gk. ekhinos "sea urchin," originally "porcupine, hedgehog" + derma (gen. dermatos) "skin;" so called from its spiky shell.
Online Etymology Dictionary, © 2001 Douglas Harper
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