echinoderm definition - Dictionary

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echinoderm

e·chi·no·derm [ i knə dùrm ] (plural e·chi·no·derms)

noun

Definition:

ocean invertebrate: an invertebrate ocean animal with a radially symmetrical body, tube feet, and a system of calcareous plates under the skin. Starfish, sea urchins, sea lilies, and sea cucumbers are echinoderms. Phylum Echinodermata.

[Mid-19th century. <echino- + Greek derma "skin"]

e·chi·no·der·mal [ i knə dúrm'l ] adjective

e·chi·no·der·ma·tous [ i knə dúrmətəss ] adjective