Crastinum
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
or CRASTINO (Lat. tomorrow). On the day after. The return day of writs is made the second day of the term; the first day being some saint's day, which gives its name to the term. In the law Latin, crastino (the morning, the day after) would then denote the return day.
2 Reeve, Hist. Eng. Law, 56, 57.