ˈbitteringn.
A preparation used to adulterate beer; = bittern n.2 2.
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the world > food and drink > drink > manufacture of alcoholic drink > brewing > [noun] > preparation used for adulteration
bittern1775
bittering1864
1864 in Webster's Amer. Dict. Eng. Lang.
This entry has not yet been fully updated (first published 1887; most recently modified version published online March 2012).
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n.1864