n. A matter of doctrine; also, a system of doctrines. T. Goodwin. Sir T. Elyot. [ 1913 Webster ]
a. [ LL. doctrinalis, fr. L. doctrina: cf. F. doctrinal. See Doctrine. ]
The word of God serveth no otherwise than in the nature of a doctrinal instrument. Hooker. [ 1913 Webster ]
adv. In a doctrinal manner or form; by way of teaching or positive direction. [ 1913 Webster ]
a. [ L. trinus triple, trini three each, fr. tres, tria, three. See Three, and cf. Trine, a. & n., Tern, a. ] Threefold. “Trinal unity.” Milton. [ 1913 Webster ]
In their trinal triplicities on high. Spenser. [ 1913 Webster ]