Key Points. 1  Megaloblasts are large nucleated RBC precursors with noncondensed chromatin. 2  The most common causes of megaloblastic, macrocytic anemia are deficiency or defective utilization of vitamin B12 or folate. 3  Do CBC, RBC indices, reticulocyte count, and peripheral smear.
Wiktionary (0.00 / 0 votes) Rate this definition: vein (Noun). A blood vessel that transports blood from the capillaries back to the heart. vein (Noun). (used in plural veins) The entrails of a shrimp. vein (Noun). In leaves, a thickened portion of the leaf containing the vascular bundle. vein (Noun).
A vein is a blood vessel or a distinctive style. Vain means self admiring or futile. (The term in vain means without success). A vane is a stabilizing fin or blade. The words vein, vain, and vane sound identical, but their meanings are very different. The noun vein has several meanings: A blood vessel that carries blood from the capillaries towards the heart. varicose veins A distinctive style or manner. A layer of ore or mineral between layers of rock.