cnidarian definition

  • noun:
    • some of various invertebrate creatures regarding the phylum Cnidaria, described as a radially shaped body with a saclike inner hole, and such as the jellyfishes, hydras, ocean anemones, and corals. Also referred to as coelenterate.
    • any one of various invertebrate creatures, including jellyfish, hydras, sea anemones, corals and formerly sponges and ctenophores that fit in with the phylum Cnidaria.
    • radially symmetrical animals having saclike figures with only one opening and tentacles with stinging structures; they take place in polyp and medusa types
  • adjective:
    • Of, relating to, or from the phylum Cnidaria.

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