a market-town of England, on the borders of Cambridgeshire and Hertfordshire, in a bleak country, in the midst of downs, 13 miles S.S.W. of Cambridge. It has a fine modern market-house, a church that once belonged to a priory of St Augustine, places of worship for Independents and Unitarians, several schools of various kinds, and a mechanics' institute, provided with a library. Beneath the market-house was discovered in 1742 a curious old cavern, cut out in the chalk of the district, in the shape of a bell, and curiously carved. Malting, brewing, &c., form the occupations of the inhabitants; and there is some trade in corn. Pop. (1851) 2061.