soil- +

(Latin: bottom; under surface; earth, dirt)

solum (s), sola (pl); true soil
1. The bottom; the lowest part of something.
2. The upper layer of a soil profile where the formation of new soil takes place and where most plant roots and soil animals are found.
3. The upper layers of the soil profiles, affected by climate and vegetation; especially, plant roots.
subsoil
1. The layer of soil between the topsoil and bedrock.
2. The compacted soil beneath the topsoil.

Cross references of word families related directly, or indirectly, to: "land, ground, fields, soil, dirt, mud, clay, earth (world)": agra-; agrest-; agri-; agro-; argill-; choro-; chthon-; epeiro-; geo-; glob-; lut-; myso-; pedo-; pel-; rhyp-; sord-; terr-.