noun, noun which may take the genitive case particle 'no'
Refers to the most essential, concentrated part of something abstract, such as a philosophy, art, or skill. Often used in formal or literary contexts.
この本には日本文化の精髄が詰まっている。
This book contains the essence of Japanese culture.
The master passed on the quintessence of martial arts to his disciple.
精髄 is a literary, formal word for the quintessential core of something, while エッセンス is a casual loanword usable in everyday speech.
Compound of 精 (refined, essence) and 髄 (marrow, pith). The combination suggests the innermost, most refined part of something.