CD (disambiguation)

A CD or compact disc is a thin plastic silvery disc for audio recordings.

CD or cd may also refer to:

Science and technology

Astronomy and cosmology

• Cordoba Durchmusterung, a star catalog of the southern sky
• Cosmological decade or CÐ, a unit of time
• Type-cD galaxy, a galaxy morphology classification

Biology, ecology, and medicine

• Coeliac disease, long term autoimmune disorder causing intolerance to gluten
• Conduct disorder, a psychological disorder
• Conservation Dependent or LR/cd, an IUCN category
• Cluster of differentiation, a protocol used for the identification of cell surface molecules on white blood cells
• Crohn's disease
• Chlordane
• Communicable disease

Computing

• CD-ROM, compact disc technology applied for use in computer data
• cd (command), a command line command to change the current working directory in operating systems
• continuous delivery, a software development design practice
• continuous deployment, a software development design practice
• collision detection, CSMA/CD

Mathematics

• cd (elliptic function), one of Jacobi's elliptic functions

Other uses in science and technology

• Cadmium or Cd, a chemical element
• Candela or cd, a unit of light intensity
• -CD, the North American call sign suffix for Class A low-power television stations operating with digital signals
• Circular dichroism, a form of spectroscopy
• Critical Dimension, the minimum feature size that a projection system can print in photolithography
• Drag coefficient or c_d, a dimensionless quantity used to quantify the drag of an object in a fluid

Businesses and organizations

Government, military, and political

• Canadian Forces Decoration, by post-nominal letters
• Centre Democrats (Denmark), a Danish former political party
• Centre Democrats (Netherlands), a former political party of the Netherlands
• Civil defense, an effort to protect the citizens of a state from military attack and natural disasters
• Community of Democracies, an intergovernmental organization of democracies and democratizing countries
• Conference on Disarmament, an international forum that negotiates multilateral arms control and disarmament agreements
• Corps Diplomatique, the collective body of foreign diplomats accredited to a particular country or body
• Centro Democratico, a political party in Italy
• Democratic Republic of the Congo, by ISO 3166-1 alpha-2 country code
  • .cd, the Internet domain of the Democratic Republic of the Congo

Other business and organizations

• Certificate of deposit, a bank account in the United States with a fixed maturity date
• České dráhy or ČD, a railway operator of the Czech Republic
• Commander of the Order of Distinction, a rank in the Jamaican Orders of Societies of Honour

Places

• Central District, Seattle, a district in Seattle

Other uses

• cd., abbreviation for caddesi, street, in Turkish
• 400 (number), written CD in Roman numerals
• 205 (number), written CD in hexadecimal
• "CD", a song by T2 (band)
• Geely CD, a coupe automobile made by Geely Automobile
• Christian democracy, a political ideology
• Cairo Damascus or Damascus Document, a text found among the Dead Sea Scrolls
• Committee Draft, a status in the International Organization for Standardization
• Companion dog (title), a title offered to dogs by the American Kennel Club for dog obedience
• Cross-dressing, the act of wearing clothing associated with the opposite sex
• Corendon Dutch Airlines (IATA code)
• Sega Mega-CD
  • Sonic CD