From Middle English flask, flaske (“case, cask, keg”), from Old English flasce, flaxe (“bottle, flask”) and Medieval Latin flascō (“bottle”); from Frankish *flasko, *flaska; whence also Dutch fles; both from Proto-Germanic *flaskǭ (“braid-covered bottle, wicker-enclosed jug”) (whence also German Low German Flaske, Fless, German Flasche), from Proto-Indo-European *ploḱ-skō (“flat”) (whence also Lithuanian plókščias, Czech ploský, Albanian flashkët).
flask (plural flasks)
- A narrow-necked vessel of metal or glass, used for various purposes; as of sheet metal, to carry gunpowder in; or of wrought iron, to contain quicksilver; or of glass, to heat water in, etc.
- A container used to discreetly carry a small amount of a hard alcoholic beverage; a pocket flask.
- (sciences) Laboratory glassware used to hold larger volumes than test tubes, normally having a narrow mouth of a standard size which widens to a flat or spherical base.
- (engineering) A container for holding a casting mold, especially for sand casting molds.
- A bed in a gun carriage.
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flask (plural flaskes)
- (rare) A small barrel for beer storage.
- (rare) A container for the storage of garments.