echinoderm

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e·chi·no·derm

(e-kī'nō-derm),
A member of the phylum Echinodermata.
Farlex Partner Medical Dictionary © Farlex 2012

echinoderm

any member of the phylum Echinodermata, including the sea urchins, starfish, brittle-stars, sea cucumbers, feather stars and sea lillies. The phylum is characterized by a pentaradiate structure (a five-sided RADIAL SYMMETRY) and the presence of tube feet in most forms.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005