Etymology
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bedrock (n.)

also bed-rock, in geology, "solid rock lying under soil or gravel," 1850, from bed (n.) + rock (n.). Figurative use by 1869; as an adjective by 1881.

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Definitions of bedrock

bedrock (n.)
solid unweathered rock lying beneath surface deposits of soil;
bedrock (n.)
principles from which other truths can be derived;
Synonyms: fundamentals / basics / fundamental principle / basic principle
From wordnet.princeton.edu