Tun

n. [A-S. tunne, Icel., Sw., & O. H. Ger. tunna, Dan. tönde, D. ton, L. & M. H. Ger. tunne, N. H. Ger. tonne, Ir. & Gael. tunna, tonna, W. tynell, Armor. tonel, Fr. tonne, tonneau, Pr. tona, Sp. & Pg. tonel, L. Lat. tŏnna, tunna.]

1. A large cask; an oblong vessel bulging in the middle, like a pipe or puncheon, and girt with hoops.
2. A certain measure for liquids, as for wine, consisting of two pipes or four hogsheads, or 252 gallons. In different countries, the tun differs in quantity.
3. (Com.) A weight of 2240 pounds. [Rare.] See TON.
4. A large quantity;—used proverbially. Shak.
5. A drunkard;—humorously so called, or in contempt. Dryden.