Bryn Mawr (BREN MAHR), uninc. town (1990 pop. 3,271), Lower Merion township, Montgomery co., SE Pa., a residential suburb 10 mi/16 km WNW of downtown Philadelphia; 40°01'N 75°19'W. Drained by Mill Creek. Light mfg. (powdered metals; printing and publishing). Seat of Bryn Mawr Col., opened in 1885 by the Society of Friends; Ellen Cushing Col., Harcun Col.