Relating to or characterized by the increase of cells of the bone marrow: A myeloproliferative syndrome is one example of cell growth of the fatty network of connective tissue that fills the cavities of bones.

Myeloproliferative medullary and extramedullary proliferation of bone marrow constituents include erythroblasts, granulocytes, megakaryocytes, and fibroblasts.

Myeloproliferative formation is also characterised by the unusual development of myelopoietic tissue, or the formation of the tissue elements of bone marrow, or any of the types of blood cells derived from bone marrow or even of both processes.