- a substance or organism causing fermentation, as yeast, bacteria, enzymes, etc.
- a state of excitement or agitation
Origin of fermentMiddle English from Old French from Classical Latin fermentum, leaven, yeast from fervere, to boil, be agitated: see barm
- to cause fermentation in
- to excite; agitate
- to be in the process of fermentation
- to be excited or agitated; seethe