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Definition of Understratum
1. n. The layer, or stratum, of earth on which the mold, or soil, rests; subsoil.
2. n. The layer, or stratum, of earth on which the mold, or soil, rests; subsoil.
Definition of Understratum
1. Noun. The layer, or stratum, of earth on which the soil rests; the subsoil. ¹
¹ Source: wiktionary.com