barrel

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barrel:

see English units of measurementEnglish units of measurement,
principal system of weights and measures used in a few nations, the only major industrial one being the United States. It actually consists of two related systems—the U.S.
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barrel

[′bar·əl]
(design engineering)
A container having a circular lateral cross section that is largest in the middle, and ends that are flat; often made of staves held together by hoops.
A piece of small pipe inserted in the end of a cartridge to carry the squib to the powder.
That portion of a pipe having a constant bore and wall thickness.
(mechanics)
Abbreviated bbl.
The unit of liquid volume equal to 31.5 gallons (approximately 119 liters).
The unit of liquid volume for petroleum equal to 42 gallons (approximately 158 liters).
The unit of dry volume equal to 105 quarts (approximately 116 liters).
A unit of weight that varies in size according to the commodity being weighed.
(naval architecture)
The central part of a windlass or capstan about which the cable is wound.
(optics)
A tapering cylindrical housing which contains the lenses of a camera and the iris diaphragm.
(ordnance)
The cylindrical metallic part of a gun which controls the initial direction of a projectile.

barrel

1. A weight measure for portland cement in the US, corresponding to 376 pounds net; this measure is now obsolete.
2. (US) A vessel which holds 311/2 gal of liquid.
3. That portion of a pipe having a constant bore and wall thickness.

barrel

1. a unit of capacity used in brewing, equal to 36 Imperial gallons
2. a unit of capacity used in the oil and other industries, normally equal to 42 US gallons or 35 Imperial gallons
3. the trunk of a four-legged animal
4. the quill of a feather
References in classic literature ?
Balashev found Davout seated on a barrel in the shed of a peasant's hut, writing- he was auditing accounts.
Being only seamen, on seamen's wages, they hailed with delight the news that they were bound in for a tropic isle to fill their water- barrels.
My companion appeared actually frightened, and I could hardly credit my senses when I saw him suddenly throw his gun to his shoulder and fire both barrels at the agitated grain
All these I secured, together with several things belonging to the gunner, particularly two or three iron crows, and two barrels of musket bullets, seven muskets, another fowling-piece, with some small quantity of powder more; a large bagful of small shot, and a great roll of sheet-lead; but this last was so heavy, I could not hoist it up to get it over the ship's side.
Pickwick was busily engaged in counting the barrels of oysters and superintending the disinterment of the cod-fish, when he felt himself gently pulled by the skirts of the coat.
Apart from the name upon the barrel, the idea had occurred to me.
But good did come of the apple barrel, as you shall hear, for if it had not been for that, we should have had no note of warning and might all have perished by the hand of treachery.
The Prince, too, had got lost like the rest, and wandered on for a time until he came to a little clearing in the forest not far from the sea, where he saw a woman sitting on a chair and a big barrel standing beside her.
But just at that moment somebody knocked at the front door, and Moppet jumped into the flour barrel in a fright
He sat his mount as we sit a horse, grasping the animal's barrel with his lower limbs, while the hands of his two right arms held his immense spear low at the side of his mount; his two left arms were outstretched laterally to help preserve his balance, the thing he rode having neither bridle or reins of any description for guidance.
But here the cord was not more than ten fathoms long, and the extremity was attached to a small barrel which, by floating, was to show the course the dugong took under the water.
Now, these reflections had led him further than he intended, and the day was beginning to decline when, by the last ray of the setting sun, he thought he saw the barrel of a musket glitter from behind a hedge.