noun🔗ShareAn animal of the phylum Echinodermata, comprising radially symmetric, spiny-skinned marine animals including seastars, sea urchins, sea cucumbers, crinoids, and sand dollars."While visiting the aquarium, my daughter learned that a starfish is an echinoderm with five arms and a spiny surface. "animalbiologyoceannaturescienceChat with AIVocabulary GamePractice Reading
