Definitions for "Cnidarian"
member of phylum Cnidaria (also called Coelenterata), the group to which sea anemones, corals, jellyfish, and hydras belong
nid-air-y-an Invertebrates with thin sack-like bodies (e.g. jellyfish).
radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms