opac

from The Free On-line Dictionary of Computing (8 July 2008)

Online Public Access Catalog
OPAC

   <library> (OPAC) A computerised system to catalogue and
   organise materials in a library (the kind that contains
   books).  OPACs have replaced card-based catalogues in many
   libraries.  An OPAC is available to library users (public
   access).

   (2000-07-17)