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understratum

N ชั้น ที่อ ยุ่ ข้างใต้  ชั้นล่าง 

 

Webster's 1828 Dictionary

UNDERSTRATUM

n.Subsoil; the bed or layer of earth on which the old or soil rests.

 

Webster's 1913 Dictionary

UNDERSTRATUM

Un "der *stra `tum, n.; pl. L. Understrata (, E. Understratums (.

 

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