tunPronunciation: (tun), [key]
—n., v., tunned, tun•ning.
a large cask for holding liquids, esp. wine, ale, or beer.
a measure of liquid capacity, usually equivalent to 252 wine gallons.
to put into or store in a tun or tuns.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.