Relating to, serving for, or promoting fermentation; fitted for or used in the fermentation process.
From fermentum (Latin leaven) plus the suffix -atory (relating to or serving), similar to 'laboratory' but specific to fermentation contexts.
In older brewing texts you'll see 'fermentatory' vessels described—those large wooden barrels and ceramic crocks that were designed specifically to let fermentation happen at the right pace and temperature.
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