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Entry 1 sense Webster, 1913

Rolodex

/(rôl"ō̇*dĕks)/ · Rol·o·dex · IPA /rˈoʊlədˌɛks/
01 a. A trade name for a type of card file; as, a Rolodex(R) card file. Also used informally and improperly as a noun meaning Rolodex(R) card file.
  1. 1.
    A trade name for a type of card file; as, a Rolodex(R) card file. Also used informally and improperly as a noun meaning Rolodex(R) card file. Also: Rolodex(R) card file