One of the mysteries of the English language finally explained.
1Originally: abnormal proliferation of white blood cell (granulocyte) precursors; an instance of this. Later also (chiefly with distinguishing word): abnormal proliferation of erythroid precursors or megakaryocytes.
2Degenerative disease of the spinal cord; specifically (in full "funicular myelosis") degeneration of the posterior and lateral columns, sometimes associated with pernicious anaemia.
Mid 19th century (in an earlier sense). From myelo- + -osis. In sense 3, after German Myelosis, Myelose.
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