Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity, and including the jellyfishes, hydras, sea anemones, and corals. Also called coelenterate.
adj.Of, relating to, or belonging to the phylum Cnidaria.
[New Latin Cnīdāria, phylum name, from Greek knīdē, sea nettle.]







