Webster's English Dictionary

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vat

1. vat \'vat\ n [ME fat, vat, fr. OE ft; akin to OHG vaz vesse]l, Lith 
   poudas pot 1: a large vessel (as a cistern, tub, or barrel) esp. for 
   holding liquors i n an immature state or preparations for dyeing or tanning 
   2: a liquor containing a dye converted into a soluble reduced colorless or  
   weakly colored form that on textile material steeped in the liquor and 
   exposed to the air is converted by oxidation to the original insoluble dye 
   and precipitated in the fiber
2. vat vt or vat.ted;  or vat.ting : to put into or treat in a vat