JMdict: 1288610

骨髄 【こつずい】

  1. [n,adj-no] bone marrow; medulla
  2. [n,adj-no] true spirit; one's mind
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
骨 Skeleton, Bone, Remains, Frame コツ ほね
髄 Marrow, Pith, Essence ズイ