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Wiktionary
cadr

n. (context computing English) car of the cdr in LISP. The second element in a list.

Wikipedia
CADR

CADR may refer to:

  • CAR and CDR, a programming language construct used in Common Lisp or Scheme
  • CADR, the name of a computing system developed at M.I.T.; see Lisp machine
  • Clean Air Delivery Rate, a rating system developed for portable room air cleaners
  • Continuous Adiabatic Demagnetisation Refrigeration, a multi-stage magnetic refrigeration system