MD, Md, mD or md may refer to:

Places

Moldova Moldova ( , ; ), officially the Republic of Moldova ( ro, Republica Moldova), is a landlocked country in Eastern Europe. It is bordered by Romania to the west and Ukraine to the north, east, and south. The unrecognised state of Transnistr ...

(ISO country code MD) *

Maryland Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...

(US postal abbreviation MD) *

Magdeburg Magdeburg (; nds, label=Low Saxon, Meideborg ) is the capital and second-largest city of the German state Saxony-Anhalt. The city is situated at the Elbe river. Otto I, the first Holy Roman Emperor and founder of the Archdiocese of Magdebu ...

(vehicle plate prefix MD), a city in Germany *

Mödling District Bezirk Mödling is a district of the state of Lower Austria in Austria. Municipalities Suburbs, hamlets and other subdivisions of a municipality are indicated in small characters. * Achau * Biedermannsdorf * Breitenfurt bei Wien * Brunn am Gebir ...

(vehicle plate prefix MD), in Lower Austria, Austria

People

Muhammad (name) Muhammad (), also spelled Muhammed or Muhamad or Mohammad or Mohammed or Mohamed or in a variety of other ways, is an Arabic given male name literally meaning 'Praiseworthy'. The name comes from the passive participle of the Arabic verb (حَم� ...

or Mohammed (Md)

Arts, entertainment, and media

Music

* ' or ' (MD or m.d.; "right hand"), in piano scores * Music director *

Mini Disc MiniDisc (MD) is an erasable magneto-optical disc-based data storage format offering a capacity of 60, 74, and later, 80 minutes of digitized audio. Sony announced the MiniDisc in September 1992 and released it in November of that year f ...

Other arts, entertainment, and media

* ''MDs'' (TV series), 2002 * ', ("Materials and discussions for the analysis of classical texts"), an Italian journal

Brands and enterprises

* Air Madagascar, IATA airline code *

McDonnell Douglas McDonnell Douglas was a major American aerospace manufacturing corporation and defense contractor, formed by the merger of McDonnell Aircraft and the Douglas Aircraft Company in 1967. Between then and its own merger with Boeing in 1997, it pro ...

aircraft model prefix *

MD Helicopters MD Helicopters, LLC. (formerly McDonnell Douglas Helicopter Systems) is an American aerospace manufacturer. It produces light utility helicopters for commercial and military use. The company was a subsidiary of Hughes Aircraft until 1984, when Mc ...

Science and technology

Biology and medicine

Doctor of Medicine Doctor of Medicine (abbreviated M.D., from the Latin ''Medicinae Doctor'') is a medical degree, the meaning of which varies between different jurisdictions. In the United States, and some other countries, the M.D. denotes a professional degree. T ...

, a medical degree *

Medial dorsal nucleus The medial dorsal nucleus (or dorsomedial nucleus of thalamus) is a large nucleus in the thalamus. It is believed to play a role in memory. Structure It relays inputs from the amygdala and olfactory cortex and projects to the prefrontal cortex ...

, a cluster of neurons in the thalamus * Muscular dystrophy, a group of diseases involving breakdown of skeletal muscles *

Ménière's disease Ménière's disease (MD) is a disease of the inner ear that is characterized by potentially severe and incapacitating episodes of vertigo, tinnitus, hearing loss, and a feeling of fullness in the ear. Typically, only one ear is affected initi ...

, a disorder of the inner ear *

MD (Ayurveda) M.D.(Doctor of Medicine in Ayurveda) or ''Ayurveda Vachaspati'' is the three-year master's course in the Indian medical system of Ayurveda. MD/MS (Ayurveda) is offered in many medical colleges in India and Sri Lanka. The selection to the MD/MS (Ayu ...

, a degree in Indian medicine

Computing

.md .md is the Internet country code top-level domain (ccTLD) for Moldova Moldova ( , ; ), officially the Republic of Moldova ( ro, Republica Moldova), is a landlocked country in Eastern Europe Eastern Europe is a subregion of the Europe ...

, Internet top-level domain for Moldova *

Markdown Markdown is a lightweight markup language for creating formatted text using a plain-text editor. John Gruber and Aaron Swartz created Markdown in 2004 as a markup language that is appealing to human readers in its source code form. Markdown i ...

(file extension .md), a format *

Microdrive The Microdrive is a registered trademark for miniature, 1-inch hard disks produced by IBM and Hitachi. These rotational media storage devices were designed to fit in CompactFlash (CF) Type II slots. The release of similar drives by other ...

, a type of miniature hard drive *

mkdir The mkdir (make directory) command in the Unix, DOS, DR FlexOS, IBM OS/2, Microsoft Windows, and ReactOS operating systems is used to make a new directory. It is also available in the EFI shell and in the PHP scripting language. In DOS, OS/2, ...

or md, "make directory" command * Multiple device, as in Linux

mdadm mdadm is a Linux utility used to manage and monitor software RAID devices. It is used in modern Linux distributions in place of older software RAID utilities such as raidtools2 or raidtools. mdadm is free software originally maintained by, ...

device driver * Sega Genesis or Mega Drive, a video game console

Other uses in science and technology

* Mean absolute difference *

Mendelevium Mendelevium is a synthetic element with the symbol Md ( formerly Mv) and atomic number 101. A metallic radioactive transuranium element in the actinide series, it is the first element by atomic number that currently cannot be produced in macrosco ...

, symbol Md, a chemical element * Mesoscale discussion in Storm Prediction Centerssand Weather Prediction Centers *

Methyldichloroarsine Methyldichloroarsine, sometimes abbreviated "MD" and also known as methyl Dick, is an organoarsenic compound with the formula CH3AsCl2. This colourless volatile liquid is a highly toxic vesicant that has been used in chemical warfare. History ...

, a chemical warfare agent *

Millidarcy Darcy, Darci or Darcey may refer to: Science * Darcy's law, which describes the flow of a fluid through porous material * Darcy (unit), a unit of permeability of fluids in porous material * Darcy friction factor in the field of fluid mechanics ...

(mD), a unit of fluid permeability *

Molecular dynamics Molecular dynamics (MD) is a computer simulation method for analyzing the physical movements of atoms and molecules. The atoms and molecules are allowed to interact for a fixed period of time, giving a view of the dynamic "evolution" of t ...

Membrane distillation Membrane distillation (MD) is a thermally driven separation process in which separation is driven by phase change. A hydrophobic membrane presents a barrier for the liquid phase, allowing the vapour phase (e.g. water vapour) to pass through the m ...

Earthquake duration magnitude The concept of Earthquake Duration Magnitude – originally proposed by E. Bisztricsany in 1958 using surface waves only - is based on the realization that on a recorded earthquake seismogram, the total length of the seismic wavetrain – sometim ...

()

Other uses

* MD,

1500 Year 1500 ( MD) was a leap year starting on Wednesday of the Julian calendar. The year 1500 was not a leap year in the Proleptic Gregorian calendar. The year was seen as being especially important by many Christians in Europe, who thought i ...

in Roman numerals *

Majority decision A majority decision (MD) is a winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts and others sports involving striking. In a majority decision, two of the three judges agree on whi ...

, in full-contact combat sports *

Managing director A chief executive officer (CEO), also known as a central executive officer (CEO), chief administrator officer (CAO) or just chief executive (CE), is one of a number of corporate executives charged with the management of an organization especially ...

, of a company * Marque déposée or trademark in Canada in

Unicode subscripts and superscripts Unicode has subscripted and superscripted versions of a number of characters including a full set of Arabic numerals. These characters allow any polynomial, chemical and certain other equations to be represented in plain text without using any ...

* Match Director in

International Practical Shooting Confederation The International Practical Shooting Confederation (IPSC) is the world's largest shooting sport association, and the largest and oldest within practical shooting. Founded in 1976, the IPSC nowadays affiliates over 100 regions from Africa, America ...

match *

Military districts of Russia The military districts in Russia serve as administrative divisions for the Russian Armed Forces. Each district features a geographical territory based on Russia's federal subjects, and a headquarters administering the military formations based i ...

, sometimes abbreviated as MD *

MDMA 3,4-Methylenedioxymethamphetamine (MDMA), commonly seen in tablet form (ecstasy) and crystal form (molly or mandy), is a potent empathogen–entactogen with stimulant properties primarily used for recreational purposes. The desire ...

, sometimes abbreviated as MD {{disambiguation