road·bed (r d b d )n. 1. a. The foundation upon which the ties, rails, and ballast of a railroad are laid. b. A layer of ballast directly under the ties. 2. The foundation and surface of a road. |
roadbed [ˈrəʊdˌbɛd]
n
1. (Engineering / Civil Engineering) the material used to make a road
2. (Engineering / Civil Engineering) a layer of ballast that supports the sleepers of a railway track
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | roadbed - a bed supporting a road bed - a foundation of earth or rock supporting a road or railroad track; "the track bed had washed away" safety island, safety isle, safety zone, traffic island - a curbed area in a roadway from which traffic is excluded; provides safe area for pedestrians |
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