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.]

Source: Webster's Revised Unabridged Dictionary (1913)
 

Vat \Vat\, v. t. [imp. & p. p. Vatted; p. pr. & vb. n. Vatting.]

To put or transfer into a vat.

Source: Webster's Revised Unabridged Dictionary (1913)