air-line

[ air-lahyn ]
/ ˈɛərˌlaɪn /

adjective

straight; direct; traveling a direct route: Some railroads advertise air-line routes between stations.

Origin of air-line

An Americanism dating back to 1805–15
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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