American Heritage® Dictionary of the English Language, Fourth Edition
- n. A substratum.
Century Dictionary and Cyclopedia
- n. A substratum; an underlying stratum; the stratum lying immediately beneath, or forming the lower portion of the one designated: not often used except figuratively.
GNU Webster's 1913
- n. The layer, or stratum, of earth on which the mold, or soil, rests; subsoil.
- under- + stratum (Wiktionary)
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