plural noun Ed·rio·as·ter·oi·dea

Definition of Edrioasteroidea

  1. :  a class of extinct echinoderms (subphylum Pelmatozoa) with a plated but flexible body resembling a sac

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Origin and Etymology of edrioasteroidea

New Latin, from edrio- (from Greek hedraios sedentary, stationary) + Asteroidea

Seen and Heard

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a rounded knoll or a ridge of ice

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