Source : Webster's Revised Unabridged Dictionary (1913)

Vat \Vat\, n. [A dialectic form for fat, OE. fat, AS. f[ae]t;
   akin to D. vat, OS. fat, G. fass, OHG. faz, Icel. & Sw. fat,
   Dan. fad, Lith. p?das a pot, and probably to G. fassen to
   seize, to contain, OHG. fazz?n, D. vatten. Cf. {Fat} a vat.]

Vat \Vat\, v. t. [imp. & p. p. {Vatted}; p. pr. & vb. n.
   {Vatting}.]
   To put or transfer into a vat.

Source : WordNet®

VAT
     n 1: a tax levied on the difference between a commodity's price
          before taxes and its cost of production [syn: {value-added
          tax}, {ad valorem tax}]
     2: a large open vessel for holding or storing liquids [syn: {tub}]