ˌ ̷ ̷ ̷ ̷ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈrȯidēə noun plural
Usage: capitalized
Etymology: New Latin, from edrio- (from Greek hedraios sedentary, stationary) + Asteroidea
: a class of extinct echinoderms (subphylum Pelmatozoa) with a plated but flexible body resembling a sac