Source : Webster's Revised Unabridged Dictionary (1913)

Prowler \Prowl"er\, n.
   One that prowls. --Thomson.

Source : WordNet®

prowler
     n : someone who prowls or sneaks about; usually with unlawful
         intentions [syn: {sneak}, {stalker}]

Source : Free On-Line Dictionary of Computing

prowler
     
        ({Unix}) A {daemon} that is run periodically (typically once a
        week) to seek out and erase {core} files, truncate
        administrative logfiles, nuke "lost+found" directories, and
        otherwise clean up the cruft that tends to pile up in the
        corners of a file system.
     
        See also {GFR}, {reaper}, {skulker}.
     
        (1995-02-14)