Reference meaning
subgrade
Last updated
The layer of native soil on which the foundation of a road is laid.
Other meanings
2. noun
A taxon ranking immediately below grade.
Source and scope
This definition is reproduced from English Wiktionary, sense en-subgrade-en-noun-wdtc7VVE, under the CC BY-SA 4.0. It has not yet received VocabularyBase editorial review. Read the source and license details.