Large wooden barrels or containers used for storing and aging liquids like wine, whiskey, or beer.
From Spanish 'casco' meaning 'helmet' or 'wooden vessel,' which came from Latin 'quassus' meaning 'broken' or 'shattered'—because barrels are made from staved wood.
The flavor of whiskey depends hugely on what cask it aged in—even a cask that previously held sherry or rum will add distinct flavors, which is why distillers carefully track and reuse their wooden barrels like precious treasures.
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