cnidarian

• 刺胞动物，一类身体呈辐射对称的水生动物，体呈囊状，只有一个开口，触手上有刺细胞；通常有固着的水螅体（水螅型）和自由游泳的水母体（水母型）两种形态，如珊瑚、水母和海葵。

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.

   辐射对称的水生动物

   • 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.

   同义词coelenterate