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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.
(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
e•chi•no•derm(ɪˈkaɪ nəˌdɜrm, ˈɛk ə nə-)
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.
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.
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|Noun||1.||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
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