card catalog is a noun meaning "a library catalog in which each publication is described on a separate file card". It carries 2 recorded senses.
a library catalog in which each publication is described on a separate file card
an alphabetical listing of items (e.g., books in a library) with a separate card for each item
Definitions, synonyms and semantic relations for card catalog come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.