The Collaborative International Dictionary of English v.0.48:
Harvester \Har"vest*er\ (-[~e]r), n. 1. One who harvests; a machine for cutting and gathering grain; a reaper. [1913 Webster] 2. (Zool.) A harvesting ant. [1913 Webster]WordNet (r) 3.0 (2006):
harvester n 1: someone who helps to gather the harvest [syn: harvester, reaper] 2: farm machine that gathers a food crop from the fields [syn: harvester, reaper]