Definition of "barrel"

barrel

/ˈbæɹ(ə)l/

noun
plural barrels
1. (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.
  Quotations
  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).
  2013 August 3, “Yesterday’s fuel”, in The Economist, volume 408, number 8847
  1. Such a cask of a certain size, holding one-eighth of what a tun holds. (See a diagram comparing cask sizes.)
2. The quantity which constitutes a full barrel: the volume or weight this represents varies by local law and custom.
  Quotations
  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.
  1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 205
3. A solid drum, or a hollow cylinder or case
4. A metallic tube, as of a gun, from which a projectile is discharged.
  Quotations
  You're shooting stars from the barrel of your eyes
  2010, Deftones, Beauty School
5. (television) A ceiling-mounted tube from which lights are suspended.
  Quotations
  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, Gerald Millerson, Lighting for TV and Film, page 325
  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.
  2013, Brian Fitt, Joe Thornley, Lighting Technology, page 118
6. (archaic) A tube.
7. (zoology) The hollow basal part of a feather.
8. (music) The part of a clarinet which connects the mouthpiece and upper joint, and looks rather like a barrel (1).
9. (surfing) A wave that breaks with a hollow compartment.
10. (US, specifically New England) A waste receptacle.
11. The ribs and belly of a horse or pony.
12. (obsolete) A jar.
  Quotations
  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. [...]
  1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], 1 Kings 17:12, column 2
13. (biology) Any of the dark-staining regions in the somatosensory cortex of rodents, etc., where somatosensory inputs from the contralateral side of the body come in from the thalamus.
14. (baseball) A statistic derived from launch angle and exit velocity of a ball hit in play.
verb
third-person singular simple present barrels, present participle barrelling or barreling, simple past and past participle barrelled or barreled
1. (transitive) To put or to pack in a barrel or barrels.
2. (intransitive) To move quickly or in an uncontrolled manner.
  Quotations
  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”).
  2017 July 23, Brandon Nowalk, “The great game begins with a bang on Game Of Thrones (newbies)”, in The Onion AV Club‎
  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.
  2012, John Branch, “Snow Fall: The Avalanche at Tunnel Creek”, in New York Times‎
3. (intransitive) To assume the shape of a barrel; specifically, of the image on a computer display, television, etc., to exhibit barrel distortion, where the sides bulge outwards.