echinoderm

Other forms: echinoderms

Definitions of echinoderm

1. noun

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

   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

   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:

   invertebrate

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