Proliferative: Growing and increasing in number rapidly. For example, the lymphoproliferative disorders are diseases in which there is malignant growth of lymphoid cells and of cells from the reticuloendothelial system (which take up and sequester inert particles). As another example, the myeloproliferative disorders are malignancies of certain bon... Found on http://www.medterms.com/script/main/art.asp?articlekey=18076