Medical term:

Echinodermata

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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