trinitarian

• POS: Adjective, Noun
• HYPHEN: Trin=i=tar=i=an

CIDE DICTIONARY

trinitarian, a. [Cf. F. trinitaire. See Trinity.].

 Of or pertaining to the Trinity, the doctrine of the Trinity, or believers in that doctrine.  [1913 Webster]

trinitarian, n. 

•  One who believes in the doctrine of the Trinity.  [1913 Webster]
•  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 Moslems.  [1913 Webster]

OXFORD DICTIONARY

trinitarian, n. & adj.
--n. a person who believes in the doctrine of the Trinity.
--adj. of or relating to this belief.

Derivative

Trinitarianism n.