cnidarian

• Animal aquatique à symétrie radiale dont le corps en forme de sac possède une seule ouverture et des tentacules garnis de cellules urticantes ; il existe sous forme de polype ou de méduse.

A noun referring to a radially symmetrical aquatic animal with a saclike body, a single opening, and tentacles armed with stinging cells; it exists in both polyp and medusa forms.

1. Radially symmetrical aquatic animalC2formalscientific

   An aquatic invertebrate animal with a saclike body, a single opening, and tentacles armed with stinging cells; it exists in both polyp and medusa forms.

   Cnidaire

   • Jellyfish and corals are well-known examples of cnidarians.
   • The cnidarian's tentacles contain specialized cells called cnidocytes.
   • Many cnidarians exhibit a complex life cycle alternating between polyp and medusa stages.

   Synonymescoelenterate