from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The smallest unit or volume of soil that contains all the soil horizons of a particular soil type, usually having a surface area of 10.76 square feet or approximately 1 square meter and extending from the ground surface down to bedrock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. In soil science, a three-dimensional body of soil with dimensions large enough to permit the study of individual soil horizons.
Greek, soil.(American Heritage® Dictionary of the English Language, Fourth Edition)