Echinoderm

Origin

Ancient Greek ἐχῖνος ("hedgehog") + δέρμα ("skin")

Full definition of echinoderm

Noun

1. Any member of the Echinodermata, a group of radially symmetric, spiny-skinned marine animals. Examples of echinoderms include seastars, sea urchins, sea cucumbers, crinoids, and sand dollars.