- bedrock - solid unweathered rock lying beneath surface deposits of soil
--1 is a kind of rock, stone
- fundamentals, basics, fundamental principle, basic principle, bedrock - principles from which other truths can be derived; "first you must learn the fundamentals"; "let's get down to basics"
--2 is a kind of principle
--2 has particulars:rudiment, first rudiment, first principle, alphabet, ABC, ABC's, ABCs - fundamentals, basics, fundamental principle, basic principle, bedrock - principles from which other truths can be derived; "first you must learn the fundamentals"; "let's get down to basics"