Source : Webster's Revised Unabridged Dictionary (1913)

Bot \Bot\, n. (Zo["o]l.)
   See {Bots}.

Source : WordNet®

bot
     n : botfly larva; typically develops inside the body of a horse
         or sheep or human

Source : Free On-Line Dictionary of Computing

bot
     
         (From "{robot}") Any type
        of autonomous {software} that operates as an {agent} for a
        user or a {program} or simulates a human activity.  On the
        {Internet}, the most popular bots are programs (called
        {spiders} or crawlers) used for searching.  They access {web
        sites}, retrieve documents and follow all the {hyperlinks} in
        them; then they generate catalogs that are accessed by {search
        engines}.
     
        A {chatbot} converses with humans (or other bots).  A
        {shopbot} searches the Web to find the best price for a
        product.  Other bots (such as {OpenSesame}) observe a user's
        patterns in navigating a web site and customises the site for
        that user.
     
        {Knowbots} collect specific information from {web sites}.
     
        (1999-05-20)