• IPA: /ˈku.də/, /ˈku.dɚ/
  • IPA: /ˈkʌd.ə/, /ˈkʌd.ɚ/

cdr (plural cdrs)

  1. (computing) The second part of a cons in LISP. The rest of a list when the first element is removed.
    • 2000, Matt Kaufmann, Panagiotis Manolios, and 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.
Antonyms Related terms


  1. (telephony) Initialism of call detail record}: a computer record representing a unit of traffic handled by a telephone exchange.
  2. Initialism of common data transfer rate#English|data rate.
  3. Initialism of content of decrement of register: cdr is a Lisp (and Scheme) instruction, that has become a verb in the MIT: "to cdr down" means to evaluate the items of a list one by one.
  4. (ophthalmology) Initialism of cup-to-disc ratio.

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