Source : WordNet®

pub
     n : tavern consisting of a building with a bar and public rooms;
         often provides light meals [syn: {public house}, {saloon},
          {pothouse}, {gin mill}, {taphouse}]
     [also: {pubbing}, {pubbed}]

Source : Free On-Line Dictionary of Computing

PUB
     
        1. PUBlishing.  A 1972 text-formatting language for {TOPS-10},
        with syntax based on {SAIL}.  Influenced {TeX} and {Scribe}.
        ["PUB: The Document Compiler", Larry Tesler, Stanford AI Proj
        Op Note, Sept 1972].
     
        2. /pub, the top-level, publicly accessible directory on most
        {anonymous FTP} archives.  This is usually where the
        interesting files are.  See {pubic directory}.