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Air line

noun

Definitions

Noun
  1. 1
    A pipe or tube supplying air or compressed air.

    "Air-lines from the reservoirs to supply points are 2-in. bore heavy gauge polythene pipes which are carried underground, embedded in sand."

  2. 2
    A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if longer route that was more advantageous was available.

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