Main Entry: tun

Pronunciation: \ˈtən\

Function: noun

Etymology: Middle English tonne, tunne, from Old English & Anglo-French; Old English, from Medieval Latin tunna; Anglo-French tone, tonne, from Medieval Latin

Date: before 12th century

1 : a large cask especially for wine
2 : any of various units of liquid capacity; especially : one equal to 252 gallons