a parliamentary borough and market-town of Wales, Montgomeryshire, near the confluence of the Dulas and Dovey, 35 miles W. from Montgomery. It stands in a pleasant valley, and consists of well built and spacious streets. The chief edifices are the town-hall, built in 1783, and used also as a market-house; and the church, a plain but tasteful building, with an embattled tower. An old house situate here constituted the senate-hall, where the lords and commons of Wales assembled in 1402 at the call of Owen Glyndwr, whom they acknowledged and crowned Prince of Wales. The manufactures of the town are unimportant, comprising chiefly wool and leather; but a brisk trade is carried on in the produce of the county. Machinlleth is supposed to have been the Magloa of the Romans—a military station, erected to overawe the mountainers. Some Roman remains are found in the vicinity. Machinlleth combines with Newtown, Welshpool, Llanidloes, Montgomery, and Llanyllin, in returning a member to parliament. Market-day, Wednesday. Pop. (1851) 1673.