WordReference Random House Unabridged Dictionary of American English © 2025
card′ in′dex, 
  1. Library Sciencea file or catalog consisting of cards on which information has been entered so that desired items or data can be readily found.
  • 1840–50, American.

Collins Concise English Dictionary © HarperCollins Publishers::
card index, card file
  1. an index in which each item is separately listed on systematically arranged cards
 card-index
  1. (transitive) to make such an index of (a book)
'card index' also found in these entries (note: many are not synonyms or translations):
card file

Forum discussions with the word(s) "card index" in the title:


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