noun
Refers to the innermost essential part of something, often used metaphorically for the vital core of an idea, matter, or being.
この問題の心髄は、信頼の欠如にある。
The core of this problem lies in a lack of trust.
noun
Used for the central point or focal area of an organization, activity, or system.
その研究所は、この分野の研究の心髄となっている。
That research institute has become the hub of research in this field.
noun
bottom of one's heart; innermost feelings
Emphasizes the deepest, most sincere part of one's emotions or thoughts; often used in expressions like 心髄から (from the bottom of one's heart).
彼の言葉は心髄からのものだった。
His words came from the bottom of his heart.
Compound of 心 (heart/mind) and 髄 (marrow). The combination suggests the innermost core, akin to the marrow within bones, extended metaphorically to the essential part of something.