Definition of flasks:
(n) :
A container used to discreetly carry a small amount of a hard alcoholic beverage; a pocket flask.
(n) :
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.
(n) :
(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.
(n) :
A nuclear flask, a large, secure lead-lined container for the transport of nuclear material.
(n) :
(engineering) A container for holding a casting mold, especially for sand casting molds.
(n) :
A bed in a gun carriage.