bedrock

Bedrock is the hard layer of rock beneath looser rocks and soil. In some places, the bedrock is exposed, while in others it lies deep underground.

A geologist who's interested in studying the bedrock in different areas might have to dig through the various layers of soil to reach that bedrock. You can also use the word in a figurative way, to mean "the heart of the matter," or "the basic, fundamental principles." For example, you might say that fairness and freedom is the bedrock of a good government. The word combines bed — here meaning "plot of land" — and rock.

Definitions of bedrock
  1. noun
    solid unweathered rock lying beneath surface deposits of soil
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    type of:
    rock, stone
    a lump or mass of hard consolidated mineral matter
  2. noun
    principles from which other truths can be derived
    synonyms: basic principle, basics, fundamental principle, fundamentals
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    types:
    ABC, ABC's, ABCs, alphabet, first principle, first rudiment, rudiment
    the elementary stages of any subject (usually plural)
    type of:
    principle
    a basic truth or law or assumption
Word Family