Source : Webster's Revised Unabridged Dictionary (1913)

Harvester \Har"vest*er\, n.
   1. One who harvests; a machine for cutting and gathering
      grain; a reaper.

   2. (Zo["o]l.) A harvesting ant.

Source : WordNet®

harvester
     n 1: someone who helps to gather the harvest [syn: {reaper}]
     2: farm machine that gathers a food crop from the fields [syn:
        {reaper}]