subgrade

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noun

The layer of native soil on which the foundation of a road is laid.

OriginEnglish grade ← Latin sub- →
UncommonScrabble 12
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Meanings

nounsubgrade (plural subgrades)

plural subgrades

  1. The layer of native soil on which the foundation of a road is laid.
  2. systematicsA taxon ranking immediately below grade.

Origin

  1. Latinsub
  2. Latinsub-
  3. Englishsub-
  4. Englishgrade
  5. Englishsubgrade

From sub- + grade.

Full word history & related roots →

Translations

Chinese Mandarin 路基
  • 路基 (lùjī)layer of soil under the road
Czech podloží
  • podložílayer of soil under the road
Finnish pohjamaa
  • pohjamaalayer of soil under the road
Spanish subrasante
  • subrasantelayer of soil under the road
Cite this entry
APA

subgrade. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/subgrade

MLA

“subgrade.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/subgrade. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “subgrade,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/subgrade.

Source: subgrade on Wiktionary, CC BY-SA 4.0.