echinodermatous


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e·chi·no·derm

 (ĭ-kī′nə-dûrm′)
n.
Any of numerous radially symmetrical marine invertebrates of the phylum Echinodermata, which includes the starfishes, sea urchins, and sea cucumbers, having an internal calcareous skeleton and often covered with spines.

[From New Latin Echīnodermata, phylum name : echino- + -dermata, -skinned (from Greek derma, dermat-, skin; see -derm).]

e·chi′no·der′mal, e·chi′no·der′ma·tous (-dûr′mə-təs) adj.
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