(flask, fläsk) noun
1. A small bottle or similar vessel.
2. A small container, often of metal, for carrying liquids or liquor on the person.
3. A metal or horn vessel used by hunters to carry gunpowder.
4. A thin long–necked glass bottle covered with straw, as for oil.
5. A frame for holding a founding mold.
6. Any of variously shaped receptacles of glass or other material, used in laboratory work.
7. The commercial unit for the measurement and sale of mercury, equal to 76 pounds.
8. The iron container in which mercury is sold. [<F flasque <Med. L flasca, var. of flasco. See FLAGON.]

(flask, fläsk) noun Mil.
1. The side plates forming the trail of a gun carriage.
2. Obs. The bed of a gun carriage. [<F flasque cheek of a gun carriage]