Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substratum.

from The Century Dictionary.

  • noun A substratum; an underlying stratum; the stratum lying immediately beneath, or forming the lower portion of the one designated: not often used except figuratively.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

under- +‎ stratum

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Examples

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