1. pertaining to, derived from or resembling bone marrow. 2. pertaining to the spinal cord. 3. having the appearance of myelocytes, but not derived from bone marrow.
m.:erythroid (M:E) ratio — the ratio of myeloid to erythroid cells found in an examination of the bone marrow; provides an assessment of bone marrow activity.
m. metaplasia — hyperplasia of the bone marrow, with erythroid phthisis and compensatory splenomegaly and sometimes hepatomegaly. It is usually succeeded by bone marrow fibrosis and sclerosis. The initiating cause is usually not apparent.