Medical term:

echinoderm

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

E·chi·no·der·ma·ta

(e-kī'nō-der'mă-tă),

A phylum of Metazoa that includes starfish, sea urchins, sea lilies, and other classes. All but the sea cucumbers (Holothuroidea) are basically radially symmetrical and most possess a calcareous endoskeleton with external spines. They inhabit the sea bottom, some near shore, others in deep water.

[echino- + G. derma, skin]

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