The layer of soil between the topsoil and bedrock.

synonym: undersoil.

Roget 221: interiority; inside, interior; interspace^†, subsoil, substratum; intrados.    contents etc. 190; substance, pith, marrow; backbone etc. (center) 222; heart, bosom, breast; abdomen; vitals, viscera, entrails, bowels, belly, intestines, guts, chitterings^†, womb, lap; penetralia [Lat.], recesses, innermost recesses; cave etc. (concavity) 252.    ... show more

Roget 342: land, earth, ground, dry land, terra firma.    continent, mainland, peninsula, chersonese [Fr.], delta; tongue of land, neck of land; isthmus, oasis; promontory etc. (projection) 250; highland etc. (height) 206.    coast, shore, scar, strand, beach; playa; bank, lea; seaboard, seaside, seabank^†, seacoast, seabeach^†; ironbound coast; loom of the land; derelict; innings; alluvium, alluvion^†; ancon.    riverbank, river bank, levee.    soil, glebe, clay, loam, marl, cledge^†, chalk, gravel, mold, subsoil, clod, clot; rock, crag.    acres; real estate etc. (property) 780; landsman^†.    ... show more

Dutch: ondergrond, onderlaag, substraat
Polish: podglebie