DEFINITION of 'Windfall Tax'. A tax levied by governments against certain industries when economic conditions allow those industries to experience above-average profits. Windfall taxes are primarily levied on the companies in the targeted industry that have benefited the most from the economic windfall, most often commodity-based businesses.
acute leukemia leukemia in which the involved cell line shows little or no differentiation, usually consisting of blast cells; two types are distinguished, acute lymphoblastic leukemia and acute myelogenous leukemia. acute granulocytic leukemia acute myelogenous leukemia.
1 Osteoblasts. 2  Cells that are derived from osteoprogenitor cells and are responsible for the synthesis of the organic components of bone matrix, which is called osteoid. 3  They are located on the surface of bone tissue and resemble epithelium. Endosteum: Thin layer of osteoprogenitor cells, osteoblasts and a small amount of connective tissue that lines all internal surfaces of cavities within bone including the osteonic canals and marrow spaces. 2  Bone Matrix. 3  Mature bone is made up of approximately 70% inorganic salts and 30% organic matrix by weight.