bedrock

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. solid unweathered rock lying beneath surface deposits of soil
• Hypernyms:
rock, stone
2. principles from which other truths can be derived
- first you must learn the fundamentals
- let's get down to basics
• Syn:
fundamentals, basics, fundamental principle, basic principle
• Hypernyms:
principle
• Hyponyms:
rudiment, first rudiment, first principle, alphabet, ABC,
ABC's, ABCs