understratums

1 definition found

understratums - Collaborative International Dictionary of English v.0.48 :

  Understratum \Un"der*stra`tum\, n.; pl. L. Understrata, E.
     Understratums.
     The layer, or stratum, of earth on which the mold, or soil,
     rests; subsoil.
     [1913 Webster]