any of a phylum (Echinodermata) of marine animals with a water-vascular system, and usually with a hard, spiny skeleton and radial body, including the starfishes and sea urchins
Origin of echinodermfrom Modern Latin Echinodermata: see echino- and -derm
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.
Origin of echinodermFrom 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
Ancient Greek ἐχῖνος (ekhinos, “hedgehog”) + δέρμα (derma, “skin”)