sub·​grade ˈsəb-ˌgrād How to pronounce subgrade (audio)
: a surface of earth or rock leveled off to receive a foundation (as of a road)

Example Sentences

Recent Examples on the Web The project also includes the removal and installation of drainage structures, sidewalks, curbs and gutters, utilities, canal excavation, base, subgrade and new pavement, Keller said. Austen Erblat,, 1 Dec. 2021 The Eagle Lake project included rehabilitation of the existing 6 miles of carriage road surface, subgrade and drainage. From Usa Today Network And Wire Reports, USA TODAY, 4 Nov. 2021 Water flows through the cracks in a street and weaken the gravel base layer and the ground, called the subgrade. Laurinda Joenks, Arkansas Online, 17 Feb. 2021 Center Ridge Road, west of Jaycox Road: · Crews will continue grading the subgrade, filling in with 304 stone, and installing underdrain. Linda Gandee, cleveland, 27 Apr. 2020 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, 11 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'subgrade.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1893, in the meaning defined above

Time Traveler
The first known use of subgrade was in 1893

Dictionary Entries Near subgrade

Cite this Entry

“Subgrade.” Dictionary, Merriam-Webster, Accessed 2 Dec. 2022.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words Named After People

  • name tags
  • Namesake of the leotard, Jules Léotard had what profession?
True or False

Test your knowledge - and maybe learn something along the way.

Universal Daily Crossword

A daily challenge for crossword fanatics.