Jisho

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Noun
1. bone marrow; medullaAnatomy
Noun
2. heart's core; depths of one's heart
Noun
3. main point; vital partObsolete term
Wikipedia definition
4. Bone marrowBone marrow is the flexible tissue found in the interior of bones. In humans, bone marrow in large bones produces new blood cells. On average, bone marrow constitutes 4% of the total body mass of humans; in an adult weighing 65 kilograms (140 lb), bone marrow accounts for approximately 2.6 kilograms (5.7 lb).
Read “Bone marrow” on English Wikipedia
Read “骨髄” on Japanese Wikipedia
Read “Bone marrow” on DBpedia

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