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1. (n.) roadbed
the bed or foundation for the track of a railroad.
2. roadbed
the layer of ballast immediately beneath the ties of a railroad track.
3. roadbed
the material of which a road is composed.
Etymology: (1830–40)
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| Definition of 'roadbed' |
Princeton's WordNet |
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1. (noun) roadbed
a bed supporting a road
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| Definition of 'roadbed' |
Webster Dictionary |
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1. (noun) roadbed
in railroads, the bed or foundation on which the superstructure (ties, rails, etc.) rests; in common roads, the whole material laid in place and ready for travel
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