Biddeford (bĭdˈĭfərd) [key], city (1990 pop. 20,710), York co., SW Maine, on the Saco River; inc. as a town 1718, as a city 1855. Settled in 1630, the town exported lumber and fish, and in 1840 the first cotton mill was built. Biddeford manufactures blankets, linens, shoes, clothing, and electrical appliances. Biddeford Pool is a resort at the mouth of the Saco River. A campus of the Univ. of New England is in the city.