See also: CDR and CD-R


Alternative formsEdit


Acronym of contents of the decrement part of register number. Note that it was based on original hardware and has no meaning today.


  • IPA(key): /ˈku.də/, /ˈku.dɚ/
  • (file)
  • IPA(key): /ˈkʌd.ə/, /ˈkʌd.ɚ/
  • (file)
  • (file)


Diagram for the list (42 69 613). The car of the first cons is 42, and the cdr points the next cons.

cdr (plural cdrs)

  1. (programming) The second part of a cons in Lisp. The remainder of a list when the first element is removed.
    Antonym: car
    • 2000, Matt Kaufmann; Panagiotis Manolios; J Strother Moore, Computer-aided reasoning: an approach:
      The elements of a list are the successive cars along the "cdr chain." That is, the elements are the car, the car of the cdr, the car of the cdr of the cdr, etc.

Derived termsEdit

Further readingEdit