| MAC | anemia in which the average size of erythrocytes is larger than normal |
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| MAC | the presence of macrocytes in the blood |
| MAC | a genus of Melolonthidae |
| MAC | common North American beetle: larvae feed on roots and adults on leaves and flowers of e.g. rose bushes or apple trees or grape vines |
| MAC | derivative of nitrofuran used as an antibacterial medicine (trade name Macrodantin) effective against a broad range of Gram-positive and Gram-negative bacteria |
| MAC | of or relating to macroeconomics |
| MAC | an economist who specializes in macroeconomics |
| MAC | the branch of economics that studies the overall working of a national economy |
| MAC | an economist who specializes in macroeconomics |
| MAC | evolution on a large scale extending over geologic era and resulting in the formation of new taxonomic groups |
| MAC | tissue consisting of large stellate neuroglial cells |
| MAC | a congenital disorder characterized by an abnormally large tongue |