tritheˈisticaladj. of, pertaining to, or believing tritheism.
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tritheistic1698
tritheistical1708
1708 H. DodwellNat. Mortality Humane Souls 44 Our Adversaries will appear to be the Tritheistical Gobarus's, as to this Particular of the Heresies then condemned in the Tritheists.
1822 T. JeffersonWritings (1830) IV. 354 Missionaries..from the tritheistical school of Andover.