- 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.
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
- 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