noun
bone marrow; medulla
Anatomical term for the soft tissue inside bones.
骨髄移植は白血病の治療に用いられる。
Bone marrow transplants are used to treat leukemia.
noun
heart's core; depths of one's heart
Figurative use for the innermost feelings or essence of a person.
その言葉は彼の骨髄に染み入った。
Those words penetrated to the core of his being.
noun
main point; vital part
Obsolete sense for the essential or most important part of something.
古い文献では、議論の骨髄を突くという表現が見られる。
In old texts, one finds the expression 'to strike at the marrow of an argument'.