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echinoderm (plural echinoderms)
- An animal of the phylum Echinodermata, comprising radially symmetric, spiny-skinned marine animals including seastars, sea urchins, sea cucumbers, crinoids, and sand dollars. [from 19th c.]
- 2012, Caspar Henderson, The Book of Barely Imagined Beings, 2013 edition, Granta Books, page 47:
- Many echinoderms are still bilateral as larvae, and swim freely in the ocean like baby fish.
member of the Echinodermata