noun road·bed \ˈrōd-ˌbed\

Definition of roadbed

  1. 1a :  the bed on which the ties, rails, and ballast of a railroad restb :  the ballast or the upper surface of the ballast on which the ties rest

  2. 2a :  the earth foundation of a road prepared for surfacingb :  the part of the surface of a road traveled by vehicles


First Known Use of roadbed


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