echinoderm

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e·chi·no·derm

(ĭ-kī′nə-dûrm′)

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 Echīnodermata, 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.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

echinoderm

(ɪˈkaɪnəʊˌdɜːm)

(Animals) 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

eˌchinoˈdermal, eˌchinoˈdermatous adj

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

e•chi•no•derm

(ɪˈkaɪ nəˌdɜrm, ˈɛk ə nə-)

n.

any marine invertebrate animal of the phylum Echinodermata, including starfishes and sea urchins, characterized by a five-part radially symmetrical body and a calcareous endoskeleton.

[1825–35; taken as singular of New Latin Echinodermata, neuter pl. of echinodermatus < Greek echîn(os) sea urchin + -o- -o- + -dermatos -derm]

e•chi`no•der′ma•tous (-ˈdɜr mə təs) adj.

e·chi·no·derm

(ĭ-kī′nə-dûrm′)

Any of various invertebrate sea animals having a hard spiny outer covering, an internal skeleton, and a radially symmetrical body. Starfish, sea urchins, and sea cucumbers are echinoderms.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun

echinoderm - marine invertebrates with tube feet and five-part radially symmetrical bodies

invertebrate - any animal lacking a backbone or notochord; the term is not used as a scientific classification

water vascular system - system of fluid-filled tubes used by echinoderms in locomotion and feeding and respiration

Echinodermata, phylum Echinodermata - radially symmetrical marine invertebrates including e.g. starfish and sea urchins and sea cucumbers

ambulacrum - one of the five areas on the undersurface of an echinoderm on which the tube feet are located

sea star, starfish - echinoderms characterized by five arms extending from a central disk

brittle star, brittle-star, serpent star - an animal resembling a starfish with fragile whiplike arms radiating from a small central disc

basket fish, basket star - any starfish-like animal of the genera Euryale or Astrophyton or Gorgonocephalus having slender complexly branched interlacing arms radiating from a central disc

sea urchin - shallow-water echinoderms having soft bodies enclosed in thin spiny globular shells

crinoid - primitive echinoderms having five or more feathery arms radiating from a central disk

holothurian, sea cucumber - echinoderm having a flexible sausage-shaped body, tentacles surrounding the mouth and tube feet; free-living mud feeders

tube foot - tentacular tubular process of most echinoderms (starfish and sea urchins and holothurians) having a sucker at the end and used for e.g. locomotion and respiration

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