Cnidarian

[nahy-dair-ee-uh n] /naɪˈdɛər i ən/

noun
1.
any invertebrate animal, as a hydra, jellyfish, sea anemone, or coral, considered as belonging to the phylum , characterized by the specialized stinging structures in the tentacles surrounding the mouth; a coelenterate.
adjective
2.
belonging or pertaining to the .
/naɪˈdɛərɪən; knaɪ-/
noun
1.
any invertebrate of the phylum Cnidaria, which comprises the coelenterates
adjective
2.
of, relating to, or belonging to the Cnidaria
cnidarian
(nī-dâr’ē-ən)
Any of various invertebrate animals of the phylum Cnidaria (or Coelenterata), having a body with radial symmetry and tentacles that bear microscopic stinging capsules called nematocysts. The tentacles surround a mouth that opens into a saclike internal cavity and that is used both for ingesting food and for eliminating wastes. Cnidarians evolved in the Precambrian Era, but it is not known from what type of organism. Cnidarians include the jellyfishes, hydras, sea anemones, and corals. Also called coelenterate.