Trī-vĕrb'ĭ-al, a.

a. [From Lat. trī, q. v., and verbum, a word.] Of, or pertaining to, certain days in the Roman calendar allowed to the pretor for hearing causes, and which were so called as on them the pretor might speak the three characteristic words of his office, do, dico, addico. They were also known as dies fasti. Burrill.