سلف salaf A (from سلف To level the ground, to go before) 1. adj. Past, preceding, former (times). 2. s. m. Ancestors. 3. Money ad- vanced for merchandise, &c. 4. A purse, a bag. 5. The past, former times. ¶ silf, Brother-in-law, husband of a wifeʼs sister.