noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The layer, or stratum, of earth on which the soil rests; the subsoil.

Synonyms

All synonyms

bandbedbeddingbeltcoursedeck

Etymology

From under- + stratum.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.