a small bottle-shaped vessel for holding fluids; as, a flask of oil or wine.-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 bed in a gun carriage.-the wooden or iron frame which holds the sand, etc., forming the mold used in a foundry; it consists of two or more parts; viz., the cope or top; sometimes, the cheeks, or middle part; and the drag, or bottom part. when there are one or more cheeks, the flask is called a three part flask, four part flask, etc.