(countable) A round (cylindrical) vessel, such as a cask, of greater length than breadth, and bulging in the middle, made of staves bound with hoops, and having flat ends (heads). Sometimes applied to a similar cylindrical container made of metal, usually called a drum.
The dawn of the oil age was fairly recent. Although the stuff was used to waterproof boats in the Middle East 6,000 years ago, extracting it in earnest began only in 1859 after an oil strike in Pennsylvania. The first barrels of crude fetched $18 (around $450 at today’s prices).
1987, Keith Dunstan, The Amber Nectar, Ringwood: Vicking O'Neil, page 81:
Barrels came in firkins, nine gallons; kilderkins, eighteen gallons; halves, twenty-seven gallons; barrels, thirty-six gallons and hogsheads, fifty-four.
The quantity which constitutes a full barrel: the volume or weight this represents varies by local law and custom.
1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 205:
Again, by 28 Hen. VIII, cap. 14, it is re-enacted that the tun of wine should contain 252 gallons, a butt of Malmsey 126 gallons, a pipe 126 gallons, a tercian or puncheon 84 gallons, a hogshead 63 gallons, a tierce 41 gallons, a barrel 31.5 gallons, a rundlet 18.5 gallons.
1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 205:
23 Hen. VIII, cap. 4... The barrel of beer is to hold 36 gallons, the kilderkin 18 gallons the firkin 9. But the barrel, kilderkin, and firkin of ale are to contain 32, 16, and 8 gallons.
You're shooting stars from the barrel of your eyes
(television) A ceiling-mounted tube from which lights are suspended.
2013, Gerald Millerson, Lighting for TV and Film, page 325:
Moreover, it adds to difficulties in adjusting/servicing lamps located over high scenery, ceilings etc., where the barrel networks cannot be lowered or reached.
2013, Brian Fitt, Joe Thornley, Lighting Technology, page 118:
The barrel, which is usually from 2.0 m to 2.5 m long, and capable of lifting loads up to 120 kg, is suspended from the main housing which contains the motor gearbox unit, etc.
And ſhe ſaid, As the Lord thy God liueth, I haue not a cake, but an handfull of meale in a barrell, and a little oyle in a cruſe: [...]
New International Version translation: “As surely as the Lord your God lives,” she replied, “I don’t have any bread—only a handful of flour in a jar and a little olive oil in a jug. [...]
He came barrelling around the corner and I almost hit him.
2017 July 23, Brandon Nowalk, “The great game begins with a bang on Game Of Thrones (newbies)”, in The Onion AV Club[1]:
At a certain point, Game Of Thrones started barreling toward the end, cutting itself down to—contra Ian McShane—exposition and battles, and it lost too much of its life (not to be confused with “too many of its lives”).
2012, John Branch, “Snow Fall: The Avalanche at Tunnel Creek”, in New York Times[2]:
Snow shattered and spilled down the slope. Within seconds, the avalanche was the size of more than a thousand cars barreling down the mountain and weighed millions of pounds.