Definitions from Wiktionary ( )

▸ noun:  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.
▸ noun:  A container used to discreetly carry a small amount of a hard alcoholic beverage; a pocket flask.
▸ noun:  (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.
▸ noun:  (engineering) A container for holding a casting mold, especially for sand casting molds.
▸ noun:  A bed in a gun carriage.
▸ noun:  A nuclear flask, a large, secure lead-lined container for the transport of nuclear material.
▸ noun:  (Newfoundland) A small bottle of liquor.
▸ verb:  (dentistry) To invest a denture in a flask so as to produce a sectional mold.

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