Etymology

subgrade

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Today it means: The layer of native soil on which the foundation of a road is laid. Full definition →

English grade ← Latin sub-
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The story

  1. Latinsub
  2. Latinsub-
  3. Englishsub-
  4. Englishgrade
  5. English todaysubgrade

From sub- + grade.

Etymology from Wiktionary, CC BY-SA 4.0.