echinoderm(n = noun.animal) - marine invertebrates with tube feet and five-part radially symmetrical bodies;
is a kind of invertebrate
has parts: water vascular system, ambulacrum, tube foot
is a member of echinodermata, phylum echinodermata
has particulars: sea star, starfish, brittle-star, brittle star, serpent star, basket fish, basket star, sea urchin, crinoid, holothurian, sea cucumber
One of the Echinodermata. [1913 Webster]
echinoderm, n. any marine invertebrate of the phylum Echinodermata, usu. having a spiny skin, e.g. starfish and sea urchins.
Etymology:
ECHINUS + Gk derma -atos skin