from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The upper layers of a soil profile in which topsoil formation occurs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Within a soil profile, a set of related soil horizons that share the same cycle of pedogenic processes.
from The Century Dictionary and Cyclopedia
- n. In Scots law, ground; a piece of ground.
Latin, base, ground.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin solum ("base, bottom; soil"). (Wiktionary)