a licensed medical doctor

• postnominal title for the Doctor of Medicine degree

managing director of a company

• chief executive role in many countries

abbreviation for medical device

MiniDisc, a small optical audio disc format

Marine detachment; small Marine Corps unit aboard a ship

macular degeneration, an eye disease affecting central vision

postal abbreviation for Maryland, a U.S. state

magnetodynamic; relating to magnetic forces and motion

abbreviation for magnetodynamics