a 3,000-mile (4,800-km) long network of radar stations north of the Arctic Circle, maintained by the United States and Canada for providing advance warning of the approach of hostile planes, missiles, etc.
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British Dictionary definitions for DEW line
distant early warning line, a network of radar stations situated mainly in Arctic regions to give early warning of aircraft or missile attack on North America
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012