MD

MD, Md, mD or md may stand for:

Science

• Doctor of Medicine, from the Latin Medicinae Doctor (MD)
• Mean difference, a measure of statistical dispersion
• Md, the symbol for the chemical element Mendelevium
• Methyldichloroarsine, a blister agent used in chemical warfare
• Millidarcy (mD), one thousandth of a darcy, a unit of fluid permeability
• Molecular dynamics, a method of computer simulation of molecular interaction
• Muscular dystrophy, a genetic and hereditary muscle disease
• Medial dorsal nucleus, a large nucleus in the thalamus

Geography

• MD, United States postal abbreviation for state of Maryland
  • Md., older abbreviation for Maryland
• Moldova, a country that has the ISO country code and Internet top-level domain ".md"
• Licence-plate prefix for Magdeburg, a city in Germany

Music

• MiniDisc, an optical storage medium developed by Sony
• Music director; the term "MD" is used particularly in musical theatre

Companies

• Managing director, a term used for the chief executive of many companies
• Prefix of names of some aircraft produced by McDonnell Douglas, a former aerospace manufacturer later merged with Boeing
• IATA airline code for Air Madagascar

Computing

• RAID drive linux kernel, also known as "md" for "multiple drive"
• "md", alternative form of computer operating system command Mkdir, that creates a directory
• Microdrive, a type of miniature hard drive
• a filename extension for documentation in Markdown format

Miscellaneous

• Majority decision, a winning criterion in several full-contact combat sports
• Materiali e discussioni per l'analisi dei testi classici, a classics journal
• MDs (TV Series), a 2002 made-for-television medical drama
• Metropolitan Division, a territory unit defined by the US Office of Management and Budget as a county or group of counties within a Metropolitan Statistical Area