ingatherern.
Etymology: < in adv. + -er suffix1.Previous versions of the OED give the stress as: ˈinˌgatherer.
the world > food and drink > farming > cultivation or tillage > cultivation of plants or crops > picking or gathering > [noun] > picker or gatherer
1878 F. D. Huntington 136 One Reaper and Ingatherer and Finisher follows them.
This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2021).