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great-circle track

[greyt-sur-kuh l trak] /ˈgreɪtˈsɜr kəl ˌtræk/
noun
1.
the route of a ship following the arc of a great circle, appearing as a curved line on a Mercator chart and as a straight line on a gnomonic chart.
Origin of great-circle track
1955-1960
First recorded in 1955-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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