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DEW line

[doo, dyoo]
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noun
  1. a 3000-mile (4800–km)–long network of radar stations north of the Arctic Circle, maintained by the U.S. and Canada for providing advance warning of the approach of hostile planes, missiles, etc.
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Origin of DEW line

1955–60; D(istant) E(arly) W(arning)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for dew line

DEW line

n acronym for
  1. 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
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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