subgrade

subgrade
/sub"grayd'/, Civ. Engin., Building Trades.
n.
1. the prepared earth surface on which a pavement or the ballast of a railroad track is placed or upon which the foundation of a structure is built.
adj.
2. beneath the finished ground level of a project.
[1895-1900; SUB- + GRADE]

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Universalium. 2010.

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