Definition of tun noun from the Oxford Advanced Learner's Dictionary

 

tun

 noun
noun
BrE BrE//tʌn//
 
; NAmE NAmE//tʌn//
 
(old-fashioned)
 
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a large round wooden container for beer, wine, etc. synonym barrel Word Origin Old English tunne, from medieval Latin tunna, probably of Gaulish origin.
See the Oxford Advanced American Dictionary entry: tun