פּוּרְסָא, (פְּרַס I) division, arrangement, order, proper time (cmp. קֵץ). Sabb. 129ᵇ פ׳ דדמא כל וכ׳ the order (proper period) for blood-letting is every thirty days; פ׳ דדמא חד וכ׳ the order (proper day) for blood-letting is the first day of the week &c. Gitt. 37ᵃ (explaining פרוסבול) פ׳ דמילתא the arrangement (institution) of a measure.