tun definition by Webster's New World
- a large cask, esp. for wine, beer, or ale
- a measure of capacity for liquids, usually 252 wine gallons (954 liters)
Origin: Middle English tonne ; from Old English tunne, large cask and amp; Old French tonne, both ; from Midieval Latin tunna ; from Celtic base
tun definition by American Heritage Dictionary
- A large cask for liquids, especially wine.
- A measure of liquid capacity, especially one equivalent to approximately 252 gallons (954 liters).
Origin: Middle English, from Old English tunne, possibly of Celtic origin.