IPA: /ˈhɑːrvɪstər/
KK: /ˈhɑrvɪstər/
A machine or person that collects crops from fields when they are ready to be harvested.
The farmer used a harvester to quickly gather the wheat from the fields.
Harvester → It is formed from "harvest" (from Old English *hærfest*, meaning autumn or the time of gathering crops) and "-er" (meaning a person who). A harvester is a person who gathers crops during the harvest season.
Think of someone who gathers crops during the autumn season — that's what a harvester does.