MD

Businesses and organizations

• Managing director, or chief executive officer, of an organization
• Madagascar Airlines, IATA airline code MD
• MD, aircraft model prefix of McDonnell Douglas
• MD Helicopters, American aerospace manufacturer
• MD Discount, Italian discount supermarket

Places

• Moldova, ISO country code MD
• Maryland, United States, US postal abbreviation MD

Science and technology

Chemistry and physics

• Mendelevium, symbol Md, a chemical element
• Methyldichloroarsine, a chemical warfare agent
• Membrane distillation, a thermally driven separation process
• Millidarcy (mD), a unit of fluid permeability
• Molecular dynamics, a computer simulation method

Computing

• .md, Internet top-level domain for Moldova
• Markdown, a lightweight markup language, file extension .md
• MiniDisc, a discontinued erasable magneto-optical disc-based data storage format
• <code>md</code>, or mkdir, the "make directory" command
• Multiple device, as in Linux mdadm device driver

Medicine

• Ménière's disease, a disorder of the inner ear
• Muscular dystrophy, a group of diseases involving breakdown of skeletal muscles

Other uses in science and technology

• Mean absolute difference, a measure of statistical dispersion
• Mesoscale discussion, in Storm Prediction Centers and Weather Prediction Centers
• Earthquake duration magnitude,

Other uses

• MD, 1500 in Roman numerals
• Majority decision, in full-contact combat sports
• (marque déposée 'trademark', alternatively rendered ^MD), a Unicode compound superscript character
• Match Director in International Practical Shooting Confederation match
• Md, an alternative for Muhammad (name) or Mohammed

See also

• DM (disambiguation)