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The Jargon File, Version 4.0.0, 24 Jul 1996 by Various
page 113 of 773 (14%)
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: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.

:chad: /chad/ /n./ 1. The perforated edge strips on printer
paper, after they have been separated from the printed portion.
Also called {selvage} and {perf}. 2. obs. The confetti-like
paper bits punched out of cards or paper tape; this has also been
called `chaff', `computer confetti', and `keypunch
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