echinoderm(redirected from Echinidea)
Also found in: Dictionary, Thesaurus, Medical.
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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005