1. A small, narrow-necked bottle, typically of glass, used for holding liquids, especially chemicals or medicines.

2. A glass or metal container, typically in the shape of a flask, used for carrying and pouring alcoholic drinks.

3. A metal cup with a long handle, used for heating liquids over a flame.

4. Used in chemistry laboratories for various purposes such as heating liquids, measuring volumes, and storing chemicals.

5. In computing, Flask is a lightweight, easy-to-use web framework written in Python, used for building web applications and services.