Is “Flask” a Scrabble word?

1.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.

2.A container used to discreetly carry a small amount of a hard alcoholic beverage; a pocket flask.

3.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.

1.To invest a denture in a flask so as to produce a sectional mold.