trub

The English word “trub” has 2 meanings listed here.

noun

The layer of sediment that appears at the bottom of the fermenter after yeast has completed the bulk of the fermentation.
A truffle

Borrowed from German trüb (“not clear, turbid”). Related to droff (“turbid, sorrowful, sad”)), Dutch droef (“sad, miserable”).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.