A flourishing seaport of Renfrewshire, on the Firth of Clyde, 22 m. W. of Glasgow; it stretches some 4 m. along the shore and climbs the hill slopes behind, whence it commands a splendid view of the river and Highlands beyond; the west end is handsomely laid out, and contains some fine buildings, including the Watt Institute, with library of 130,000 vols.; the harbourage is excellent, and favours a large foreign shipping trade; the staple industries are shipbuilding, engineering, spinning, sugar-refining, &c.; coal and iron are the chief exports, and sugar and timber the largest imports.