- A flat, relatively thin container for liquor.
- A container or case for carrying gunpowder or shot.
- A vial or round long-necked vessel for laboratory use.
Origin of flask
- Middle English cask, keg from Old French flasque from Late Latin flascō of Germanic origin
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English flask (“cask, keg”), from flaske (“case”), from Anglo-Norman flascon, from Late Latin flascō (“bottle”), from Frankish *flasko (whence also Dutch fles), from Proto-Germanic *flaskǭ (“braid-covered bottle, wicker-enclosed jug”) (whence also Old English flaxe, flasce, German Flasche), from Proto-Indo-European *ploḱ-skō (“flat”) (whence also Lithuanian plókščias, Czech ploský).