eleu·ther·o·zoa \-thərəˈzōə\noun plural Usage: capitalized Etymology: New Latin, from eleuther- + -zoa : a subphylum or other division of Echinodermata including the Asteroidea, Ophiuroidea, Echinoidea, and Holothurioidea • eleu·ther·o·zo·an\ ̷ ̷| ̷ ̷ ̷ ̷ ̷ ̷|zōən\adjective or noun • eleu·ther·o·zo·ic\-ōik\adjective