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See also: CDR and CD-R



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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): /ˈkʊ.də/, /ˈkʊ.dɚ/
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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. (computing) The second part of a cons in LISP. The rest of a list when the first element is removed.
    • Matt Kaufmann, Panagiotis Manolios, and J Strother Moore, Computer-aided reasoning: an approach, 2000 :
      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.


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