a town of Belgium, in the province of S. Brabant, on the Grande Geete, 25 miles E. of Brussels. The ancient walls, dismantled since 1804, are 4 miles in circuit, but include a good deal of vacant ground and extensive gardens. The town is entered by six ancient gates, and has regular streets and several handsome squares; among which are the market-place near the centre, containing the town-hall and the church of Notre Dame, rebuilt in the fifteenth century. There are here several schools and hospitals, and manufactures of woollen cloth, hosiery, oil, soap, and paper. Tirlemont was once a much larger and more flourishing town; but it has suffered much in war, and was taken by the French in 1635, 1792, and 1794. Pop. 8975.