\Trin`i*ta"ri*an\, a. [Cf. F. trinitaire. See
{Trinity}.]
Of or pertaining to the Trinity, the doctrine of the Trinity,
or believers in that doctrine.

\Trin`i*ta"ri*an\, n.
1. One who believes in the doctrine of the Trinity.
2. (Eccl. Hist.) One of a monastic order founded in Rome in
   1198 by St. John of Matha, and an old French hermit, Felix
   of Valois, for the purpose of redeeming Christian captives
   from the Mohammedans.