subgrade

subgrade

English

Etymology

Etymology tree
Proto-Indo-European *upó
Proto-Italic *supo
Latin sub
Latin sub-der.
English sub-
English grade
English subgrade

    From sub- + grade.

    Noun

    subgrade (plural subgrades)

    1. The layer of native soil on which the foundation of a road is laid.
      Coordinate term: roadbase
    2. (systematics) A taxon ranking immediately below grade.

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