The Collaborative International Dictionary of English v.0.48:

Reaper \Reap"er\ (r[=e]p"[~e]r), n.
   1. One who reaps.
      [1913 Webster]

            The sun-burned reapers wiping their foreheads.
                                                  --Macaulay.
      [1913 Webster]

   2. A reaping machine.
      [1913 Webster]

WordNet (r) 3.0 (2006):

reaper
    n 1: someone who helps to gather the harvest [syn: harvester,
         reaper]
    2: Death personified as an old man or a skeleton with a scythe
       [syn: Grim Reaper, Reaper]
    3: farm machine that gathers a food crop from the fields [syn:
       harvester, reaper]

The Free On-line Dictionary of Computing (19 January 2023):

reaper

   A prowler that GFRs files.  A file removed in this way is
   said to have been "reaped".

   [Jargon File]


The Jargon File (version 4.4.7, 29 Dec 2003):

reaper
 n.

    A prowler that removes files. A file removed in this way is said to have
    been reaped.