any of a phylum (Cnidaria) of invertebrate animals, mainly marine, including jellyfishes, hydrozoans, and anthozoans, characterized by stinging cells and a saclike body cavity with a single opening for ingesting food and eliminating wastes; coelenterate
Origin of cnidarianModern Latin Cnidaria ; from Classical Greek knidē, nettle + -aria: so called for the creatures' stinging cells
Any of various invertebrate animals of the phylum Cnidaria, characterized by a radially symmetrical body with a saclike internal cavity and stinging nematocysts, and including the jellyfishes, hydras, sea anemones, and corals.
Origin of cnidarianNew Latin Cnīdāria, phylum name, from Greek knīdē, sea nettle.
From New Latin cnidaria + -an