| M&D | Maintenance and Diagnostics 
| Others |
| MD | Air Madagascar
| Others |
| MD | Bio-Medical Office, Kennedy Space Center
| Others |
| MD | Doctor of Medicine
| Others |
| MD | Mac Daddy
| Others |
| MD | Machine Dependent
| Others |
| MD | Macular Degeneration
| Others |
| MD | Mad Doctor
| Others |
| MD | Mad Dog
| Others |
| MD | Mad Drumming
| Others |
| MD | Mad Duckkers
| Others |
| MD | Madden Discussions
| Others |
| MD | Madhuri Dixit
| Others |
| MD | Magdeburg
| Others |
| MD | Magic Damage
| Others |
| MD | Magma Dragoon
| Others |
| MD | Magnesium Deficiency
| Others |
| MD | Maintenance Diagnostic
| Others |
| MD | Maintenance Dose
| Others |
| MD | Major Deity
| Others |
| MD | Major Doona
| Others |
| MD | Majority Decision
| Others |
| MD | Majorly Demented
| Others |
| MD | Make Decisons
| Others |
| MD | Make Directory
| Others |
| MD | Maladaptive Daydreaming
| Others |
| MD | Male treated with Deoxycorticosterone
| Others |
| MD | Malfunction Detection
| Others |
| MD | Malic De-hydrogenase
| Others |
| MD | Malice and Destruction
| Others |
| MD | Malignant Denial
| Others |
| MD | Mall Detective
| Others |
| MD | Malware Defence
| Others |
| MD | Malware Detection
| Others |
| MD | Man Days
| Others |
| MD | Management Domain
| Others |
| MD | Managing Director
| Others |
| MD | Mandatory Disclosure
| Others |
| MD | Maniacal Democrat
| Others |
| MD | Maniacal Dictator
| Others |
| MD | Maniacal Doctor
| Others |
| MD | Manic Depressant
| Others |
| MD | Manic Depressive
| Others |
| MD | Manly Dude
| Others |
| MD | Mantoux Diameter
| Others |
| MD | Manual Direct
| Others |
| MD | Manual Disconnect
| Others |
| MD | Manufactured Diagnostics
| Others |
| MD | Marek's Disease
| Others |
| MD | Marked Down
| Others |
| MD | Market Depth
| Others |
| MD | Marketing Director
| Others |
| MD | Marketing Disaster
| Others |
| MD | Marlians Dance
| Others |
| MD | Marque Deposee
| Others |
| MD | Marshalled Deployability
| Others |
| MD | Maryland
| State |
| MD | Massive Deception
| Others |
| MD | Massive Denial
| Others |
| MD | Master Detail
| Others |
| MD | Master Dimension
| Others |
| MD | Master of Disguise
| Others |
| MD | Master's Degree
| Others |
| MD | Masters Dissertation
| Others |
| MD | Material Development
| Others |
| MD | Maternal Deprivation
| Others |
| MD | Mathematical Department
| Others |
| MD | Mathematical Disposition
| Others |
| MD | Mathematically Deficient
| Others |
| MD | Mathematics Department
| Others |
| MD | Matrix Decomposition
| Others |
| MD | Matt Damon
| Others |
| MD | Matter Dominated
| Others |
| MD | Maximum Demand
| Others |
| MD | Maximum Differential
| Others |
| MD | Maybe Democrat
| Others |
| MD | Mayflower Descendant
| Others |
| MD | McCleod's Daughters
| Others |
| MD | McDonnell Douglas
| Others |
| MD | McDonnell-Douglas
| Others |
| MD | MDCD Compressed file archive
| Others |
| MD | Mean Deviation
| Others |
| MD | Mean Dork
| Others |
| MD | Meat Dog
| Others |
| MD | Media Division
| Others |
| MD | Medical Deity
| Others |
| MD | Medical Department
| Others |
| MD | Medical Design
| Others |
| MD | Medical Detective
| Others |
| MD | Medical Deviate
| Others |
| MD | Medical Devices
| Others |
| MD | Medical Director
| Others |
| MD | Medical Discharge
| Others |
| MD | Medical Dissident
| Others |
| MD | Medical Divinity
| Others |
| MD | Medical Dodo
| Others |
| MD | Medical Dunce
| Others |
| MD | Medicinae Doctor
| Others |
| MD | Medicinæ Doctor
| Others |
| MD | Medio-Dorsal
| Others |
| MD | Mediterranean Dialogue
| Others |
| MD | Medium Date
| Others |
| MD | Medium Dosage
| Others |
| MD | Medium Dose
| Others |
| MD | Medium Duty
| Others |
| MD | Medium to Difficult
| Others |
| MD | Mega-Dalton
| Others |
| MD | Mejeriselskabet Danmark
| Others |
| MD | Memory Defragmenter
| Others |
| MD | Memory Disk
| Others |
| MD | Mendelevium
| Element |
| MD | Mental Disorder
| Others |
| MD | Mentally Defective
| Others |
| MD | Mentally Deficient
| Others |
| MD | Mentally Deranged
| Others |
| MD | Mentally Disabled
| Others |
| MD | Merry Devil
| Others |
| MD | Mesio-Distal
| Others |
| MD | Message Digest
| Others |
| MD | Messy Desk
| Others |
| MD | Messy Diaper
| Others |
| MD | Meta Data
| Others |
| MD | Meta Directory
| Others |
| MD | Metaphysical Doctor
| Others |
| MD | Metered Diaphragm
| Others |
| MD | Methyl Di-chloroarsine
| Others |
| MD | MethylDopa
| Others |
| MD | MHS Doctors
| Others |
| MD | Miami Dade
| Others |
| MD | MIC Drop
| Others |
| MD | Michael Douglas
| Others |
| MD | Michael Dumbberg
| Others |
| MD | Michael's Dream
| Others |
| MD | Mickey Dolenz
| Others |
| MD | Micro Dry
| Others |
| MD | Microdot
| Others |
| MD | Microphone Doctor
| Others |
| MD | Middle Deltoid
| Others |
| MD | Mild Diabetic
| Others |
| MD | Military District
| Others |
| MD | Million Dollar
| Others |
| MD | Mind Destroying
| Others |
| MD | Mineral Dust
| Others |
| MD | Mini-Disk
| Others |
| MD | Minimum Dosage
| Others |
| MD | Ministerio de Defensa
| Others |
| MD | Minor Deity
| Others |
| MD | Minor Diety
| Others |
| MD | Minus Droids
| Others |
| MD | Mirth Defect
| Others |
| MD | Mirth Doctor
| Others |
| MD | Mis-Diagnosis
| Others |
| MD | Miscellaneous Debris
| Others |
| MD | Miserable Doctor
| Others |
| MD | Missile Defense
| Others |
| MD | Mission Director
| Others |
| MD | Mitral Disease
| Others |
| MD | Mmmmm Darlin
| Others |
| MD | Mnemonic Device
| Others |
| MD | Mobile Diagnostics
| Others |
| MD | Mobilization/Deployment
| Others |
| MD | Model Definition
| Others |
| MD | Moderate Dose
| Others |
| MD | Moderately Differentiated
| Others |
| MD | Modern Drummer
| Others |
| MD | Modify Delete
| Others |
| MD | Modular Designing
| Others |
| MD | Mogen David
| Others |
| MD | Moldavia
| Others |
| MD | Moldova
| Others |
| MD | Molecular Diameter
| Others |
| MD | Molecular Dynamics
| Others |
| MD | Mommy Dearest
| Others |
| MD | Mondale and Dukakis
| Others |
| MD | Money Deficient
| Others |
| MD | Monocular Deprivation Ophthalmology
| Others |
| MD | Monolog Doctor
| Others |
| MD | Monroe Doctrine
| Others |
| MD | Morally Deficient
| Others |
| MD | Morally Due
| Others |
| MD | More Damage
| Others |
| MD | More Death
| Others |
| MD | More Dope
| Others |
| MD | More Drinks
| Others |
| MD | More Drugs
| Others |
| MD | Moriwaki Dream
| Others |
| MD | Morning Devotional
| Others |
| MD | Morning Disaster
| Others |
| MD | Morphine And Dilauded
| Others |
| MD | Most Dangerous
| Others |
| MD | Most Divine
| Others |
| MD | Most Dominant
| Others |
| MD | Mostly Desserts
| Others |
| MD | Mother Dearest
| Others |
| MD | Motion Dynamics
| Others |
| MD | Motion-Defined
| Others |
| MD | Motor Drive
| Others |
| MD | Mountain Dew
| Others |
| MD | Mountain Dulcimer
| Others |
| MD | Mounts And Dismounts
| Others |
| MD | Mouthwatering Dishes
| Others |
| MD | Move Directory
| Others |
| MD | Movement Disorder
| Others |
| MD | Movimiento de los Descamisados
| Others |
| MD | Mucho Dough
| Others |
| MD | Muff Diver
| Others |
| MD | Muita Drena
| Others |
| MD | Multi Degree
| Others |
| MD | Multi Directional
| Others |
| MD | Multi Domain
| Others |
| MD | Multi-Definition
| Others |
| MD | Multi-Dimensional
| Others |
| MD | Multinomial Distribution statistics
| Others |
| MD | Multiple Device
| Others |
| MD | Multiple Dissemination
| Others |
| MD | Multiplication Division
| Others |
| MD | Multithreaded DLL
| Others |
| MD | Municipal Docks
| Others |
| MD | Muscular Dystrophy
| Others |
| MD | Music Director
| Others |
| MD | Musical Diversity
| Others |
| MD | Musical Doctor
| Others |
| MD | Mutable Dictionary
| Others |
| MD | Muzeul Dresda
| Others |
| MD | My Decision
| Others |
| MD | My Dog
| Others |
| MD | Myocardial Damage
| Others |
| MD | Myocardial Disease
| Others |
| MD | Mysterious Dude
| Others |
| MD | Mystery Date
| Others |
| MD | Mystery Dungeon
| Others |
| md. | mitteldeutsch
| Others |
| Md. | Mitteldeutschland
| Others |