M.D.
Abbreviation for the Latin title Medicinae Doctor, Doctor of Medicine. Sometimes written today as MD (without the period after each letter).
All medical schools in the United States and Canada award an M.D. degree, usually after 4 years undergraduate study at a college or university followed by 4 years of medical school. (Some medical schools award the M.D. after 3 years of college and/or 3 years of medical school).
In the U.K., the MBChB, the Bachelor of Medicine and Bachelor of Surgery degrees, are awarded after 5 years of what is analogous to a combined undergraduate-graduate course of study.
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- MAB
Or mab. Abbreviation for monoclonal antibody. At the end of a generic drug name, -mab indicates that the drug is a monoclonal antibody. As in adalimumab, bevacizumab, infliximab, rituximab, and trastuzumab.
- Machine, heart-lung
pumping and oxygenating blood. Blood returning to the heart is diverted through a heart-lung machine before being returned to arterial circulation. Such machines may be used during open-heart surgery. Also known as pump-oxygenator or cardiopulmonary bypass machine.
- Macrobiota
The living organisms of a region that are large enough to be seen with the naked eye.
- Macro- (prefix)
Prefix from the Greek “makros” meaning large or long. Examples of terms involving macro- include macrobiotic, macrocephaly, macrocytic, macroglossia, macrophage, macroscopic, and macrosomia. The opposite of macro- is micro-.
- Macrobiotic
Referring to the macrobiota, a region’s living organisms that are large enough to be seen with the naked eye.