CD (disambiguation)

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

CD or cd may also refer to:

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, symbol 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 cd, a dimensionless quantity used to quantify the drag of an object in a fluid
 * Cluster decay, a rare mode of nuclear decay

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
 * Centro Democratico, a political party in Italy
 * Christian democracy, a political ideology
 * 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
 * FBI Counterintelligence Division, the United States Federal Bureau of Investigation's division responsible for investigating espionage

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
 * Democratic Republic of the Congo, by ISO 3166-1 alpha-2 country code
 * .cd, the Internet domain of the Democratic Republic of the Congo
 * cd., abbreviation for caddesi, street, in Turkish

Other uses

 * 400 (number), written CD in Roman numerals
 * 205 (number), written CD in hexadecimal
 * AD 400 (CD), a year of the Common Era
 * "CD", a song by T2 (band)
 * cd, for cord (unit) of volume of wood
 * Geely CD, a coupe automobile made by Geely Automobile
 * 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