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subgrade

[ suhb-greyd ]
/ ˈsʌbˌgreɪd /
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.

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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. 2021

British Dictionary definitions for subgrade

subgrade
/ (ˈsʌbˌɡreɪd) /

noun

the ground beneath a roadway or pavement
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
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