bed-rock

bedrock

[bed-rok]
noun
1.
Geology. 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.
adjective
5.
basic; fundamental.

Origin:
1840–50, Americanism; bed + rock1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
bedrock (ˈbɛdˌrɒk)
 
n
1.  the solid unweathered rock that lies beneath the loose surface deposits of soil, alluvium, etc
2.  basic principles or facts (esp in the phrase get down to bedrock)
3.  the lowest point, level, or layer

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

bedrock
1850, from bed + rock. Figurative use from 1869.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
bedrock   (běd'rŏk')  Pronunciation Key 
The solid rock that lies beneath the soil and other loose material on the Earth's surface.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang Dictionary

bedrock definition


  1. n.
    fundamentals; solid facts. : Let's get down to bedrock and quit wasting time.
  2. mod.
    fundamental. : You've been avoiding the bedrock issues all your life.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Synonyms
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