n.radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
同义词：coelenterate
英汉双解大词典
cnidarian/naɪˈdɛərɪən, knaɪ-/
1.
N（名词）
any invertebrate of the phylum Cnidaria, which comprises the coelenterates 刺胞动物
2.
ADJ（形容词）
of, relating to, or belonging to the Cnidaria 刺胞动物的; 和刺胞动物有关的; 属于刺胞动物的