Medical Definition of medullary
1a: of or relating to the medulla of any body part or organb: containing, consisting of, or resembling bone marrowc: of or relating to the medulla oblongata or the spinal cordd: of, relating to, or formed of the dorsally located embryonic ectoderm destined to sink below the surface and become neural tissue
2: resembling bone marrow in consistency—used of cancers
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