<programming> (cdr) /ku'dr/ or /kuh'dr/ The LISP operation that returns the right-hand node of a binary tree structure. In the typical case where the tree is used to store a list, the cdr is the tail of the list, i.e. all but the first element.
The instruction format of the IBM 7090 that hosted the original LISP implementation featured two 15-bit fields called the "address" and "decrement" parts. The term "cdr" was originally "Contents of Decrement part of Register". Similarly, "car" stood for "Contents of Address part of Register".
Last updated: 2007-02-28
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Nearby terms: Content Data Model « content-free « contention slot « Contents of Decrement part of Register » context » context clash » COntext Dependent Information Language