tun

Concise Oxford English Dictionary © 2008 Oxford University Press:
tun/tʌn/

▶noun

• 1 a large beer or wine cask.

  ■ a brewer's fermenting vat.

• 2 an imperial measure of capacity, equal to 4 hogsheads.

▶verb (tuns, tunning, tunned) archaic store (wine or drink) in a tun.

– origin OE tunne, from med. L. tunna, prob. of Gaulish origin.