Tun

n.	1.	A large cask; an oblong vessel bulging in the middle, like a pipe or puncheon, and girt with hoops; a wine cask.
	2.	(Brewing) A fermenting vat.
	3.	A certain measure for liquids, as for wine, equal to two pipes, four hogsheads, or 252 gallons. In different countries, the tun differs in quantity.
	4.	(Com.) A weight of 2,240 pounds. See Ton.
	5.	An indefinite large quantity. A tun of man in thy large bulk is writ. - Dryden.
	6.	A drunkard; - so called humorously, or in contempt.
	7.	(Zool.) Any shell belonging to Dolium and allied genera; - called also tun-shell.
v. t.	1.	To put into tuns, or casks. [imp. & p. p. Tunned ; p. pr. & vb. n. Tunning.]

Noun

1.

tun - a large cask especially one holding a volume equivalent to 2 butts or 252 gals

TUN, measure. A vessel of wine or oil, containing four hogsheads.

barrel, cask