Webster's Revised Unabridged Dictionary · 1913

Understratum

Understratum , noun

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

Text from the public-domain GNU Collaborative International Dictionary of English, derived from Webster's Revised Unabridged Dictionary (1913). Definitions marked with were added by later GCIDE contributors and are not in the original 1913 edition.

Enjoying the dictionary? Support its upkeep.

Contribute on GitHub, or report issues.