Barrel
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A measure of capacity, equal to thirty-six gallons. In agricultural and mercantile parlance, as also in the inspection laws, the term "barrel" means, prima facie, not merely a certain quantity, but, further, a certain state of the article; namely, that It is in a cask.
State v. Moore, 33 N. C. 72.