CD-R
     n : a compact disc on which you can write only once and
         thereafter is read-only memory [syn: {compact disc
         recordable}, {CD-WO}, {compact disc write-once}]
Source: WordNet® 2.0

cdr /ku'dr/ or /kuh'dr/ vt. [from LISP] To skip past the first item
   from a list of things (generalized from the LISP operation on binary
   tree structures, which returns a list consisting of all but the first
   element of its argument). In the form `cdr down', to trace down a list
   of elements: "Shall we cdr down the agenda?" Usage: silly. See also
   {loop through}.

   Historical note: The instruction format of the IBM 704 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'.

   The cdr and car operations have since become bases for formation of
   compound metaphors in non-LISP contexts. GLS recalls, for example, a
   programming project in which strings were represented as linked lists;
   the get-character and skip-character operations were of course called
   CHAR and CHDR.


Source: The Jargon File

CDR
     Compact Disk - Recordable (CD), "CD-R"
     
     
Source: Virtual Entity of Relevant Acronyms