The Collaborative International Dictionary
Triverbial
Triverbial \Tri*ver"bi*al\, a. [Pref. tri- + L. verbum a word.] (Rom. Antiq.) Pertaining to, or designating, certain days allowed to the pretor for hearing causes, when be might speak the three characteristic words of his office, do, dico, addico. They were called dies fasti.
Wiktionary
triverbial
a. (context historical Roman antiquity English) Relating to, or designating, certain days allowed to the pretor for hearing causes, when he might speak the three characteristic words of his office: "do, dico, addico".