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subgrade

[suhb-greyd]Civil Engineering, Building Trades.
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noun
  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.
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adjective
  1. beneath the finished ground level of a project.
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Origin of subgrade

First recorded in 1895–1900; sub- + grade
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for subgrade

Historical Examples


British Dictionary definitions for subgrade

subgrade

noun
  1. the ground beneath a roadway or pavement
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012