pronunc at ferment I+ə(r) noun
( -s )
1. : one that ferments: as
a. : a worker who attends a fermentation process (as of moistened tobacco or of mash for beer)
b. : an organism that causes fermentation
2. or fer·men·tor “
a. : a vessel in which mash is fermented during the brewing process : a fermenting tank
b. : a laboratory apparatus for carrying out fermentation