1 [flask, flahsk]
a bottle, usually of glass, having a rounded body and a narrow neck, used especially in laboratory experimentation.
a flat metal or glass bottle for carrying in the pocket: a flask of brandy.
an iron container for shipping mercury, holding a standard commercial unit of 76 pounds (34 kg).
Metallurgy. a container into which sand is rammed around a pattern to form a mold.

1375–1425; late Middle English: cask, keg < Anglo-French, Old French flaske < Late Latin flasca, earlier flascō, of uncertain origin; compare Old English flasce, flaxe, Old High German flasca (German flasche); cf. flagon

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2 [flask, flahsk]
noun Ordnance.
the armored plates making up the sides of a gun-carriage trail.
Obsolete. the bed of a gun carriage.

1570–80; < dialectal French flasque cheek of a gun carriage < Late Latin flasca flask1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flask (flɑːsk)
1.  a bottle with a narrow neck, esp used in a laboratory or for wine, oil, etc
2.  Also called: hip flask a small flattened container of glass or metal designed to be carried in a pocket, esp for liquor
3.  See powder flask
4.  a container packed with sand to form a mould in a foundry
5.  See vacuum flask
6.  engineering cask, Also called: coffin a container used for transporting irradiated nuclear fuel
[C14: from Old French flasque, flaske, from Medieval Latin flasca, flasco, perhaps of Germanic origin; compare Old English flasce, flaxe]

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Word Origin & History

mid-14c., from M.L. flasco "container, bottle," from L.L. flasconem "bottle," probably from a Gmc. source (cf. O.E. flasce, O.H.G. flaska, M.Du. flasce, Ger. Flasche "bottle"), probably originally meaning "a bottle plaited round, case bottle" (cf. O.H.G. flechtan "to weave," O.E. fleohtan "to braid,
plait"), from P.Gmc. base *fleh- (see flax). Another theory traces it to a metathesis of L. vasculum.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
flask   (flāsk)  Pronunciation Key 
A rounded container with a long neck, used in laboratories.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
During the interview he was sitting in the studio, sipping liquid morphine from
  a flask and puffing on a cigarette.
And since they're so small, hundreds of millions can fit in a small flask.
And be sure to sneak a small flask into your pocket and walk.
Patrons tend to order their rum by the flask, along with a bowl of ice and the
  desired mixer on the side.
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