a large container, as a tub or tank, used for storing or holding liquids: a wine vat.
a preparation containing an insoluble dye converted by reduction into a soluble leuco base.
a vessel containing such a preparation.
verb (used with object), vatted, vatting.
to put into or treat in a vat.

before 1100; Middle English (south); Old English fæt vessel; cognate with Old Norse fat vessel, German Fass keg

unvatted, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vat (væt)
1.  a large container for holding or storing liquids
2.  chem a preparation of reduced vat dye
vb , vats, vatting, vatted
3.  (tr) to place, store, or treat in a vat
[Old English fæt; related to Old Frisian fet, Old Saxon, Old Norse fat, Old High German faz]

VAT ((sometimes) væt)
abbreviation for
value-added tax: a tax levied on the difference between the cost of materials and the selling price of a commodity or service

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 13c., southern variant (see V) of O.E. fæt "container, vat," from P.Gmc. *fatan (cf. O.S., O.N. fat, O.Fris. fet, M.Du., Du. vat, O.H.G. faz, Ger. faß).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Abbreviations & Acronyms
value-added tax
  1. video-assisted thoracic surgery

  2. video-assisted thoracoscopic surgery

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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Example sentences
Smartphone users will even be able to scan bar codes on the sides of individual
  vats to follow their progress.
Even in the event of a catastrophic power failure, the vats will stay cold for
  five weeks on their own.
The distilled variety is made from industrial vats of pure ethanol.
New protein-based pharmaceuticals are often made by stewing cells in big vats.
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