from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The solid rock that underlies loose material, such as soil, sand, clay, or gravel.
- n. The very basis; the foundation: Ownership of land is the bedrock of democracy.
- n. The lowest point: personal finances that were at bedrock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The solid rock that exists at some depth below the ground surface. Bedrock is rock "in place", as opposed to material that has been transported from another location by weathering and erosion.
- n. A basis or foundation.
from the GNU version of the Collaborative International Dictionary of English
- The solid rock underlying superficial formations. Also Fig.
from The Century Dictionary and Cyclopedia
- n. In mining, the older crystalline and slaty rocks which underlie the unconsolidated gravelly and volcanic beds of Tertiary and Post-tertiary ages, along the flanks of the Sierra Nevada.
- n. Hence That which underlies anything else, as a foundation; bottom layer; lowest stratum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. solid unweathered rock lying beneath surface deposits of soil
- n. principles from which other truths can be derived
bed + rock (Wiktionary)