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COELOMATE
A triploblasticorganism which has an inside, fluid-filled bodycavity which originated from the mesoderm during embryonic development.
This cavity surrounds the gut, may contain different another organs, and is called a coelom. It differs from the pseudocoels of the pseudocoelomates because it is not derived from the blastocoel. The term is used to classify multicellular animals by developmental pattern.