Subsoil

['sʌbsɒɪl] or ['sʌb'sɔɪl]

(noun.) the layer of soil between the topsoil and bedrock.

Checker: Prudence--From WordNet

(n.) The bed, or stratum, of earth which lies immediately beneath the surface soil.

(v. t.) To turn up the subsoil of.

Edited by Craig

n. the under soil: the bed or stratum of earth which lies immediately beneath the surface soil.—v.t. to turn up the subsoil of.—n. Sub′soiler.

Inputed by Liza