棘きょく皮ひ動どう物ぶつ

noun

echinoderm

Zoological term for marine invertebrates such as starfish, sea urchins, and sea cucumbers. Used in scientific and educational contexts.

• ヒトデやウニは棘きょく皮ひ動どう物ぶつに分ぶん類るいされる。