精せい髄ずい

noun, noun which may take the genitive case particle 'no'

essence; quintessence; kernel

Refers to the most essential, concentrated part of something abstract, such as a philosophy, art, or skill. Often used in formal or literary contexts.

• この本ほんには日に本ほん文ぶん化かの精せい髄ずいが詰つまっている。

  This book contains the essence of Japanese culture.

• 師し匠しょうは弟で子しに武ぶ道どうの精せい髄ずいを伝つたえた。

  The master passed on the quintessence of martial arts to his disciple.