noun
multiple myeloma
Medical term for a cancer of plasma cells in the bone marrow.
多発性骨髄腫は、骨髄の中で形質細胞が異常に増える病気です。
Multiple myeloma is a disease in which plasma cells grow abnormally in the bone marrow.
Compound of 多発性 (multiple, multifocal) + 骨髄 (bone marrow) + 腫 (tumor). The exact historical derivation is uncertain; the spelling is conventionally associated with the medical meaning.