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mailcatcher

[meyl-kach-er]
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noun Railroads.
  1. a device on a mail car that, while the train is moving, picks up mailbags suspended beside the track.
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Origin of mailcatcher

An Americanism dating back to 1870–75; mail1 + catcher
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018