ed·ri·oph·thal·ma \ˌedrēˌäfˈthalmə\noun plural Usage: capitalized Etymology: New Latin, from edri- (from Greek hedraios) + -ophthalma in some classifications: a superorder of Malacostraca that includes forms with sessile eyes and is coextensive with the orders Isopoda and Amphipoda — compare arthrostraca • ed·ri·oph·thal·ma·tous\| ̷ ̷ ̷ ̷ˌ ̷ ̷| ̷ ̷məd.əs\ored·ri·oph·thal·mous\-məs\adjective