Pronunciation: (bed'rok"), [key]
1. Geol.unbroken solid rock, overlaid in most places by soil or rock fragments.
2. bottom layer; lowest stratum.
3. any firm foundation or basis: Technical courses will be founded on a bedrock of sound, general education so as to produce a well-rounded engineer.
4. the fundamental principles, as of a teaching, belief, or science: Let's strip away the cant and get down to bedrock.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.