flask Definition

flask
noun

1. A small flat pocket bottle for alcoholic spirits.

Thesaurus: bottle, decanter, flagon, container, jar, ewer, carafe, canteen.
Form: hip flask (also)
2. A vacuum flask.
3. A narrow-necked bottle used in chemical experiments, etc.
4. A wooden, iron or steel box used to hold the mould in which a casting is made.

Etymology: 16c: from Latin flasco, possibly of Germanic origin.