- an island off SE Massachusetts: summer resort. 15 miles (24 km) long.
- an island off SE Massachusetts: formerly a centre of the whaling industry; now a resort. Length: nearly 24 km (15 miles). Width: 5 km (3 miles). Pop (county and town): 10 724 (2003 est)
island off Massachusetts, early forms include Natocke, Nantican, Nautican; from an obscure southern New England Algonquian word, perhaps meaning “in the middle of waters.” Related: Nantucketer. Resort island off Cape Cod in Massachusetts.