From Longman Dictionary of Contemporary EnglishRelated topics: Geologybedrockbed‧rock /ˈbedrɒk $ -rɑːk/ noun1BASIC[singular] the basic ideas, features, or facts on which something is basedMarriage and children are the bedrock of family life.► see thesaurus at basis2HEG[uncountable]solidrock in the ground below soil or sandExamples from the Corpusbedrock• In fact, some of the footings had rested on soil, not bedrock.• Some bedrock mineralisation has been found.• Facts are the bedrock of any trial.• They form the bedrock of our economicplanet.• All of the landswept by the floods was stripped absolutely to bedrock.• The interface between weatheredmaterial and unweathered bedrock is known as the weathering front.