- any invertebrate animal, as a hydra, jellyfish, sea anemone, or coral, considered as belonging to the phylum Cnidaria, characterized by the specialized stinging structures in the tentacles surrounding the mouth; a coelenterate.
- belonging or pertaining to the Cnidaria.
- any invertebrate of the phylum Cnidaria, which comprises the coelenterates
- of, relating to, or belonging to the Cnidaria
