CNIDARIAN
\sˈiːnɪdˈe͡əɹi͡ən], \sˈiːnɪdˈeəɹiən], \s_ˈiː_n_ɪ_d_ˈeə_ɹ_iə_n]\
Definitions of CNIDARIAN
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radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms
By Princeton University