a large cask for holding liquids, especially wine, ale, or beer.
a measure of liquid capacity, usually equivalent to 252 wine gallons.
verb (used with object), tunned, tunning.
to put into or store in a tun or tuns.

before 900; (noun) Middle English tunne, Old English; cognate with Dutch ton, German Tonne (< LG), Old Norse tunna; (v.) late Middle English, derivative of the noun

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tun (tʌn)
1.  a large beer cask
2.  a measure of capacity, usually equal to 252 wine gallons
3.  a cask used during the manufacture of beer
vb , tuns, tunning, tunned
4.  (tr) to put into or keep in tuns
[Old English tunne; related to Old High German, Old Norse tunna, Medieval Latin tunna]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"large cask," O.E. tunne, a general North Sea Gmc. word (cf. O.Fris. tunne, M.Du. tonne, O.H.G. tunna, Ger. tonne), also found in M.L. tunna (9c.) and O.Fr. tonne, perhaps from a Celtic source (cf. M.Ir., Gael. tunna, O.Ir. toun "hide, skin"). Tun-dish (1388) was a funnel made to fit into the bung of
a tun.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
  1. Tunisia

  2. Tunisian

  3. Tunisian

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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