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Caerphilly(kīrfĭl`ē, kär–), Welsh Caerffili, town (1981 pop. 42,376) and county borough, 108 sq mi (279 sq km), S Wales. Famous for its cheese-making industry, the town of Caerphilly is home to a 13th-century castle, which is the largest in Wales and the second largest in Great Britain after Windsor Castle. A number of light industries dominate the economy.
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1. a market town in SE Wales, in Caerphilly county borough: site of the largest castle in Wales (13th--14th centuries). Pop.: 31 060 (2001)
2. a county borough in SE Wales, created in 1996 from parts of Mid Glamorgan and Gwent. Pop.: 170 200 (2003 est.). Area: 275 sq. km (106 sq. miles)
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