GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Trinal , 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