What does kettle mean in cooking?

kettle means: Large metal pot usually of iron with a handle looped and lid. (in Cooking Dictionary)

What else does kettle mean?

• Metal pot for simmering or boiling, often with a lid (in Merlin Dictionary)
• An area of depression that has been left by glacial drift. This is due to the melting of an individual block of glacial glacial ice. (in Merlin Dictionary)