1. A cylindrical container holding black pepper. A pepperpot may be a pepper grinder, which holds peppercorns and includes a mechanism for grinding them, or a pepper shaker, which holds (bland) pre-ground pepper.

2. A sort of vegetable or meat stew containing pepper and dumplings.

3. A Dalek. When a Doctor Who fan says that Daleks look like pepperpots, s/he does not mean that they look like Monty Python members in drag -- despite the skirt bit -- nor that they look like stew. Rumour has it that the Daleks were in fact modeled after salt shakers, which is close enough.