- soilA mixture of mineral particles and organic material, used to support plant growth.
- soleusA broad, flat muscle that extends behind the gastrocnemius along the back of the calf.
- solumWithin a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes; the upper layers of a soil profile that are affected by climate.
- andisolA kind of soil formed in volcanic ash and containing high proportions of glass and amorphous colloidal materials, including allophane, imogolite, and ferrihydrite.
- -solForming the names of different kinds of soil.
- solifluctionSoil creep caused by waterlogged soil slowly moving downhill on top of an impermeable layer.