subgrade
[suhb-greyd]Civil Engineering, Building Trades.
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noun
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.
adjective
beneath the finished ground level of a project.
Origin of subgrade
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for subgrade
Historical Examples of subgrade
The pavement laid was bitulithic and the subgrade was an old macadam road built by the County.
Third Biennial Report of the Oregon State Highway CommissionS. Benson, W. L. Thompson, R. A. Booth, Herbert Nunn
When the work was finished, a subgrade reversed-grade drain carried the water to the shaft sump by gravity.
The side-walls and subgrade electric conduits were water-proofed with felt and pitch.
In each grade and subgrade date of commission, appointment, or warrant determines the order of precedence.
Some engineers advocate that in preparing the subgrade, the earth be thoroughly rolled; others prefer not to roll the subgrade.
American Rural HighwaysT. R. Agg
subgrade
noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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