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subgrade

noun
sub·​grade | \ ˈsəb-ˌgrād How to pronounce subgrade (audio) \

Definition of subgrade

: a surface of earth or rock leveled off to receive a foundation (as of a road)

Examples of subgrade in a Sentence

Recent Examples on the Web

 Resurfacing projects seal the surface to prevent rain water from reaching the base course and the subgrade and degrading those materials. — Mike Danahey, Elgin Courier-News, "Elgin planning $2.17 million in street resurfacing," 11 June 2018

First Known Use of subgrade

1893, in the meaning defined above

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