[suhb-soil] 
| the bed or stratum of earth or earthy material immediately under the surface soil. |
| sub·soil (sŭb'soil') n. The layer or bed of earth beneath the topsoil. tr.v. sub·soiled, sub·soil·ing, sub·soils To plow or turn up the subsoil of. sub'soil'er n. |
| subsoil (sŭb'soil') Pronunciation Key
In an ABC soil, the B horizon. The term was formerly used to mean the layer of earth below the humus or surface soil. |
