Definitions of echinoderm
  1. noun
    marine invertebrates with tube feet and five-part radially symmetrical bodies
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    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
    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
    Astrophyton muricatum
    a variety of basket star
    Echinus esculentus, edible sea urchin
    a sea urchin that can be eaten
    sand dollar
    flattened disklike sea urchins that live on sandy bottoms
    heart urchin
    sea urchin having a heart-shaped body in a rigid spiny shell
    sea lily
    crinoid with delicate radiating arms and a stalked body attached to a hard surface
    comatulid, feather star
    free-swimming stalkless crinoid with ten feathery arms; found on muddy sea bottoms
    Holothuria edulis, trepang
    of warm coasts from Australia to Asia; used as food especially by Chinese
    type of:
    any animal lacking a backbone or notochord; the term is not used as a scientific classification
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