אוּם f. (אֵם; cmp. שׁוּם, שֵׁם) 1) mother. Y. Yeb. XI, 11ᵈ top. א׳ זכר the mother of the male side, father-in-law’s mother; א׳ נקבה mother-in-law’s mother. —2) substance, bulk, as the cluster of olives (contrad. to leaves); the starting point of leprosy. Toh. IX, 8 אם היה נוגע בא׳ if the reptile touched the cluster. Neg. I, 5 הלכה לה הא׳ the original leprosy has disappeared. —3) womb. Lev. R. s. 14 end, Ar. (ed. אֵם).