echinoderm noun. [ɪ'kʌɪnǝ(ʊ)dǝ:m, 'ɛkɪn-] M19.
[formed as ECHINO- + Greek derma, -mat- skin.]
Zoology. Any member of the phylum Echinodermata of coelomate, radially symmetric animals including the starfishes, brittle-stars, sea urchins, sea cucumbers, and crinoids.

■ echino'dermal,

■ echino'dermatous adjectives of, pertaining to, or characteristic of the echinoderms M19.

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