antitrinitarian
adj//-.taɪˌ-//antitrinitarisk, antitrinitarie
(theology) Rejecting the Trinitarian doctrine that God subsists as three distinct Persons in the single substance of the Holy Trinity.
(theology) One who rejects the doctrine (or dogma) of the Trinity, the trinitarian doctrine. Such a person may be Christian or non-Christian; most Christian denominations are trinitarian.