noun
myeloma
Medical term for a malignant tumor of the bone marrow. Often appears in the compound 多発性骨髄腫 (multiple myeloma).
多発性骨髄腫は骨髄の形質細胞から発生するがんです。
Multiple myeloma is a cancer that arises from plasma cells in the bone marrow.
白血病 is leukemia, a cancer of blood-forming tissues including bone marrow, while 骨髄腫 specifically refers to myeloma, a tumor of plasma cells in the bone marrow.
From 骨髄 (bone marrow) + 腫 (tumor). The reading こつずいしゅ follows standard on'yomi for the kanji.