e•chi•no•dermɪˈkaɪ nəˌdɜrm, ˈɛk ə nə-(n.)

1. 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.

   Category: Invertebrates

Origin of echinoderm:

1825–35; taken as sing. of NL Echinodermata, neut. pl. of echinodermatus < Gk echîn(os) sea urchin +-o- -o - +-dermatos -derm

e•chi`no•der′ma•tous-ˈdɜr mə təs

adj.