Tri″nal (?), a. [L. trinus triple, trini three each, fr. tres, tria, three. See Three, and cf. Trine, a. & n., Tern, a.] Threefold. “Trinal unity.” Milton.
In their trinal triplicities on high. Spenser.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.