Webster's English Dictionary

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roadbed

road.bed \'ro-d-.bed\ n 1a: the bed on which the ties, rails, and ballast 
   of a railroad rest  1b: the ballast or the upper surface of the ballast on 
   which the ties rest  2a: the earth foundation of a road prepared for 
   surfacing  2b: the part of the surface of a road traveled by vehicles