echinoderm

[ih-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 singular of Neo-Latin Echinodermata, neuter plural of echinodermatus < Greek echîn(os) sea urchin + -o- -o- + -dermatos -dermatous

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To echinoderm
Collins
World English Dictionary
echinoderm (ɪˈkaɪnəʊˌdɜːm)
 
n
any of the marine invertebrate animals constituting the phylum Echinodermata, characterized by tube feet, a calcite body-covering (test), and a five-part symmetrical body. The group includes the starfish, sea urchins, and sea cucumbers
 
echino'dermal
 
adj
 
echino'dermatous
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Etymonline
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, © 2010 Douglas Harper
Cite This Source
American Heritage
Science Dictionary
echinoderm   (ĭ-kī'nə-dûrm')  Pronunciation Key 
Any of various marine invertebrates of the phylum Echinodermata, having a latticelike internal skeleton composed of calcite and usually a hard, spiny outer covering. The body plans of adult echinoderms show radial symmetry, typically in the pattern of a five-pointed star, while the larvae show bilateral symmetry. Echinoderms probably share a common ancestor with the hemichordates and chordates, and were already quite diversified by the Cambrian Era. They include the starfish, sea urchins, sand dollars, holothurians (sea cucumbers), and crinoids, as well as thousands of extinct forms.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
Example sentences
It is an echinoderm which have radial symmetry because of its embryonic development.
Copyright © 2014 Dictionary.com, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature