sub·grade

[suhb-greyd] Civil Engineering, Building Trades.
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.
adjective
2.
beneath the finished ground level of a project.

Origin:
1895–1900; sub- + grade

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
subgrade (ˈsʌbˌɡreɪd) [Click for IPA pronunciation guide]
 
n
the ground beneath a roadway or pavement

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Subgrade is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Unsuitable subgrade soils shall be excavated to a depth sufficient to produce a
  stable bearing surface for pavement subgrade.
Subgrade soils are prepared and compacted before the placement of subbase
  and/or base layers.
The subgrade shall be clean of loose or wet material prior to placing concrete.
Subgrade shall be compacted as specified for asphalt pavement subgrade.
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