1. A small bottle-shaped vessel for holding fluids; as, a flask of oil or wine. 2. 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. 3. A bed in a gun carriage. [Obs.] Bailey. 4. (Founding) The wooden or iron frame which holds ...