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MD, Md, mD or md may stand for:

Arts and media[edit]


  • Main droite or mano destra (abbreviated MD or m.d.), used in piano scores to mark sequences of notes that are to be played with the right hand
  • MiniDisc, an optical storage medium developed by Sony
  • Music director; the term "MD" is used particularly in musical theatre

Other media[edit]

In business[edit]


Science and technology[edit]

Biology and medicine[edit]


  • .md, Internet top-level domain for Moldova
  • "md", alternative form of computer operating system command Mkdir, that creates a directory
  • Markdown format (file extension .md)
  • Message-digest algorithm, a cryptographic hashing function
  • Microdrive, a type of miniature hard drive
  • multiple device, a device driver used to support RAID in the Linux kernel.

Other uses in science and technology[edit]

  • Mean difference, a measure of statistical dispersion
  • Mendelevium, a chemical element with symbol Md
  • Mesoscale Discussion, a short-term technical meteorological forecast concerning convection (MCD) or precipitation (MPD)
  • 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

Other uses[edit]

  • Majority decision, a winning criterion in several full-contact combat sports
  • Man-day, amount of work performed by the average worker in one day
  • Major Douglas, a British Engineer and pioneer of the Social Credit economic reform movement
  • Muhammad (name) or Mohammed, as abbreviated in Bangladesh, India, Pakistan and South East Asia

See also[edit]