coelenterate(redirected from Coelenterates)
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1. any invertebrate of the phylum Cnidaria (formerly Coelenterata), having a saclike body with a single opening (mouth), which occurs in polyp and medusa forms. Coelenterates include the hydra, jellyfishes, sea anemones, and corals
2. (loosely) any invertebrate of the phyla Cnidaria or Ctenophora